We look at the division of 10408639 by 731 
The aim is to understand the frequency of 731 in 10408639.

Going ahead to step 1:
If we divide 1 by 731, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Include the next digit (0) from the dividend after 1, then repeat: 10 / 731

On to step 2:
10 divided by 731 is 0 with a remainder of 10.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 10 leaves us with 10.
Bring next digit (4) of the dividend behind the 10 and repeat the process: 104 / 731

Moving on to step 3:
The number 731 fits into 104 0 times, leaving a remainder of 104.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 104 after subtracting 0 from 104.
Append the next digit (0) from the dividend to 104 and continue with: 1040 / 731

Let's proceed to step 4:
1040 divided by 731 is 1 with a remainder of 309.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 731 from 1040 leaves us with 309.
Take the next digit (8) from the dividend and append it to 309, then repeat: 3098 / 731

On to step 5:
3098 divided by 731 is 4 with a remainder of 174.
The number 4 becomes the next digit in our result. 
Result so far: 14.0
Deduct 2924 from 3098 and we're left with 174.
Grab the next digit (6) from the dividend, add it to 174, then carry on: 1746 / 731

Advancing to step 6:
731 can be fit into 1746 2 times, resulting in a remainder of 284.
Use 2 as the next digit of our solution. 
Result so far: 142.0
Subtracting 1462 from 1746 leaves us with 284.
Bring next digit (3) of the dividend behind the 284 and repeat the process: 2843 / 731

Going ahead to step 7:
The number 731 fits into 2843 3 times, leaving a remainder of 650.
Record the quotient 3 as the next digit in the result. 
Result so far: 1423.0
Subtracting 2193 from 2843 leaves us with 650.
Take the next digit (9) from the dividend and append it to 650, then repeat: 6509 / 731

Going ahead to step 8:
6509 divided by 731 is 8 with a remainder of 661.
Put 8 as the next digit of the answer. 
Result so far: 14238.0
Deduct 5848 from 6509 and we're left with 661.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6610, and continue the process.

Going ahead to step 9:
If we divide 6610 by 731, we get 9 and a remainder of 31.
Put 9 as the next digit of the answer. 
Result so far: 14238.9
Subtracting 6579 from 6610 leaves us with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

On to step 10:
If we divide 310 by 731, we get 0 and a remainder of 310.
The number 0 becomes the next digit in our result. 
Result so far: 14238.9
Subtract 0 from 310 to get 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

Going ahead to step 11:
731 can be fit into 3100 4 times, resulting in a remainder of 176.
Use 4 as the next digit of our solution. 
Result so far: 14238.904
If we subtract 2924 from 3100, we get 176.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1760, and continue the process.

On to step 12:
1760 divided by 731 is 2 with a remainder of 298.
Use 2 as the next digit of our solution. 
Result so far: 14238.9042
Subtracting 1462 from 1760 leaves us with 298.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2980, and continue the process.

Advancing to step 13:
When dividing 2980 by 731, we get 4 with a remainder of 56.
Put 4 as the next digit of the answer. 
Result so far: 14238.90424
Subtracting 2924 from 2980 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Step 14:
The number 731 fits into 560 0 times, leaving a remainder of 560.
Put 0 as the next digit of the answer. 
Result so far: 14238.90424
Deduct 0 from 560 and we're left with 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

Moving on to step 15:
The number 731 fits into 5600 7 times, leaving a remainder of 483.
The next digit of our result is 7. 
Result so far: 14238.9042407
Subtract 5117 from 5600 to get 483.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4830, and continue the process.

Going ahead to step 16:
731 can be fit into 4830 6 times, resulting in a remainder of 444.
The number 6 becomes the next digit in our result. 
Result so far: 14238.90424076
If we take 4386 away from 4830, we end up with 444.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4440, and continue the process.

After the division, we end up with 14238.90424076 and a remainder of 4.44e-07.