539521 divided by 19 
The aim is to understand the frequency of 19 in 539521.

Let's proceed to step 1:
The number 19 fits into 5 0 times, leaving a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Include the next digit (3) from the dividend after 5, then repeat: 53 / 19

Going ahead to step 2:
19 can be fit into 53 2 times, resulting in a remainder of 15.
The next digit of our result is 2. 
Result so far: 2.0
Subtract 38 from 53 to get 15.
Fetch the next digit (9) from the dividend, attach it to 15 and continue: 159 / 19

Moving on to step 3:
19 can be fit into 159 8 times, resulting in a remainder of 7.
Record the quotient 8 as the next digit in the result. 
Result so far: 28.0
If we subtract 152 from 159, we get 7.
Bring next digit (5) of the dividend behind the 7 and repeat the process: 75 / 19

Advancing to step 4:
19 can be fit into 75 3 times, resulting in a remainder of 18.
The number 3 becomes the next digit in our result. 
Result so far: 283.0
If we subtract 57 from 75, we get 18.
Take the next digit (2) from the dividend and append it to 18, then repeat: 182 / 19

On to step 5:
182 divided by 19 is 9 with a remainder of 11.
The next digit of our result is 9. 
Result so far: 2839.0
The remainder is 11 after subtracting 171 from 182.
Take the next digit (1) from the dividend and append it to 11, then repeat: 111 / 19

Advancing to step 6:
If we divide 111 by 19, we get 5 and a remainder of 16.
The next digit of our result is 5. 
Result so far: 28395.0
The remainder is 16 after subtracting 95 from 111.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 7:
When dividing 160 by 19, we get 8 with a remainder of 8.
Write down 8 as next digit of the result. 
Result so far: 28395.8
Subtract 152 from 160 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 8:
80 divided by 19 is 4 with a remainder of 4.
Write down 4 as next digit of the result. 
Result so far: 28395.84
Deduct 76 from 80 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 9:
When dividing 40 by 19, we get 2 with a remainder of 2.
Record the quotient 2 as the next digit in the result. 
Result so far: 28395.842
If we take 38 away from 40, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 10:
19 goes into 20 1 times with a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 28395.8421
Subtracting 19 from 20 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 11:
The number 19 fits into 10 0 times, leaving a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 28395.8421
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 12:
If we divide 100 by 19, we get 5 and a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 28395.842105
Subtract 95 from 100 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 13:
19 can be fit into 50 2 times, resulting in a remainder of 12.
The next digit of our result is 2. 
Result so far: 28395.8421052
Subtract 38 from 50 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 14:
The number 19 fits into 120 6 times, leaving a remainder of 6.
Record the quotient 6 as the next digit in the result. 
Result so far: 28395.84210526
Deduct 114 from 120 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Our division results in 28395.84210526 with a remaining 6e-09.