Let's divide 2139036 by 408
The aim is to understand the frequency of 408 in 2139036.

On to step 1:
When dividing 2 by 408, we get 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 408

Moving on to step 2:
21 divided by 408 is 0 with a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Take the next digit (3) from the dividend and append it to 21, then repeat: 213 / 408

Going ahead to step 3:
If we divide 213 by 408, we get 0 and a remainder of 213.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 213 to get 213.
Take the next digit (9) from the dividend and append it to 213, then repeat: 2139 / 408

On to step 4:
408 can be fit into 2139 5 times, resulting in a remainder of 99.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
The remainder is 99 after subtracting 2040 from 2139.
Grab the next digit (0) from the dividend, add it to 99, then carry on: 990 / 408

Step 5:
If we divide 990 by 408, we get 2 and a remainder of 174.
Write down 2 as next digit of the result. 
Result so far: 52.0
If we take 816 away from 990, we end up with 174.
Include the next digit (3) from the dividend after 174, then repeat: 1743 / 408

Moving on to step 6:
If we divide 1743 by 408, we get 4 and a remainder of 111.
Write down 4 as next digit of the result. 
Result so far: 524.0
Subtract 1632 from 1743 to get 111.
Bring next digit (6) of the dividend behind the 111 and repeat the process: 1116 / 408

Step 7:
408 can be fit into 1116 2 times, resulting in a remainder of 300.
Record the quotient 2 as the next digit in the result. 
Result so far: 5242.0
Subtracting 816 from 1116 leaves us with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Going ahead to step 8:
The number 408 fits into 3000 7 times, leaving a remainder of 144.
Record the quotient 7 as the next digit in the result. 
Result so far: 5242.7
Subtract 2856 from 3000 to get 144.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1440, and continue the process.

Advancing to step 9:
The number 408 fits into 1440 3 times, leaving a remainder of 216.
Write down 3 as next digit of the result. 
Result so far: 5242.73
Deduct 1224 from 1440 and we're left with 216.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

Moving on to step 10:
If we divide 2160 by 408, we get 5 and a remainder of 120.
Put 5 as the next digit of the answer. 
Result so far: 5242.735
Deduct 2040 from 2160 and we're left with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Let's proceed to step 11:
When dividing 1200 by 408, we get 2 with a remainder of 384.
Write down 2 as next digit of the result. 
Result so far: 5242.7352
Subtract 816 from 1200 to get 384.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3840, and continue the process.

Going ahead to step 12:
408 can be fit into 3840 9 times, resulting in a remainder of 168.
Write down 9 as next digit of the result. 
Result so far: 5242.73529
Deduct 3672 from 3840 and we're left with 168.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

Step 13:
The number 408 fits into 1680 4 times, leaving a remainder of 48.
The next digit of our result is 4. 
Result so far: 5242.735294
Subtract 1632 from 1680 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Step 14:
408 goes into 480 1 times with a remainder of 72.
Put 1 as the next digit of the answer. 
Result so far: 5242.7352941
If we take 408 away from 480, we end up with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Moving on to step 15:
If we divide 720 by 408, we get 1 and a remainder of 312.
The number 1 becomes the next digit in our result. 
Result so far: 5242.73529411
If we subtract 408 from 720, we get 312.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3120, and continue the process.

After the division, we end up with 5242.73529411 and a remainder of 3.12e-07.