13659585 divided by 839 
The aim is to understand the frequency of 839 in 13659585.

On to step 1:
839 goes into 1 0 times with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Take the next digit (3) from the dividend and append it to 1, then repeat: 13 / 839

Advancing to step 2:
13 divided by 839 is 0 with a remainder of 13.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 13 after subtracting 0 from 13.
Grab the next digit (6) from the dividend, add it to 13, then carry on: 136 / 839

On to step 3:
839 goes into 136 0 times with a remainder of 136.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 136, we get 136.
Fetch the next digit (5) from the dividend, attach it to 136 and continue: 1365 / 839

Advancing to step 4:
When dividing 1365 by 839, we get 1 with a remainder of 526.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 839 from 1365 leaves us with 526.
Take the next digit (9) from the dividend and append it to 526, then repeat: 5269 / 839

Moving on to step 5:
The number 839 fits into 5269 6 times, leaving a remainder of 235.
The number 6 becomes the next digit in our result. 
Result so far: 16.0
Deduct 5034 from 5269 and we're left with 235.
Bring next digit (5) of the dividend behind the 235 and repeat the process: 2355 / 839

Advancing to step 6:
When dividing 2355 by 839, we get 2 with a remainder of 677.
The number 2 becomes the next digit in our result. 
Result so far: 162.0
Subtract 1678 from 2355 to get 677.
Include the next digit (8) from the dividend after 677, then repeat: 6778 / 839

Moving on to step 7:
6778 divided by 839 is 8 with a remainder of 66.
The next digit of our result is 8. 
Result so far: 1628.0
Subtract 6712 from 6778 to get 66.
Take the next digit (5) from the dividend and append it to 66, then repeat: 665 / 839

Let's proceed to step 8:
665 divided by 839 is 0 with a remainder of 665.
Record the quotient 0 as the next digit in the result. 
Result so far: 16280.0
The remainder is 665 after subtracting 0 from 665.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6650, and continue the process.

Moving on to step 9:
The number 839 fits into 6650 7 times, leaving a remainder of 777.
The next digit of our result is 7. 
Result so far: 16280.7
Subtracting 5873 from 6650 leaves us with 777.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7770, and continue the process.

Advancing to step 10:
If we divide 7770 by 839, we get 9 and a remainder of 219.
The next digit of our result is 9. 
Result so far: 16280.79
The remainder is 219 after subtracting 7551 from 7770.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2190, and continue the process.

Moving on to step 11:
839 can be fit into 2190 2 times, resulting in a remainder of 512.
Put 2 as the next digit of the answer. 
Result so far: 16280.792
Deduct 1678 from 2190 and we're left with 512.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5120, and continue the process.

Going ahead to step 12:
839 can be fit into 5120 6 times, resulting in a remainder of 86.
Write down 6 as next digit of the result. 
Result so far: 16280.7926
Deduct 5034 from 5120 and we're left with 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Moving on to step 13:
When dividing 860 by 839, we get 1 with a remainder of 21.
Use 1 as the next digit of our solution. 
Result so far: 16280.79261
Subtract 839 from 860 to get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Moving on to step 14:
839 goes into 210 0 times with a remainder of 210.
Put 0 as the next digit of the answer. 
Result so far: 16280.79261
Subtracting 0 from 210 leaves us with 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Step 15:
839 can be fit into 2100 2 times, resulting in a remainder of 422.
Use 2 as the next digit of our solution. 
Result so far: 16280.7926102
Deduct 1678 from 2100 and we're left with 422.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4220, and continue the process.

Moving on to step 16:
839 goes into 4220 5 times with a remainder of 25.
The next digit of our result is 5. 
Result so far: 16280.79261025
Subtracting 4195 from 4220 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

The final outcome is 16280.79261025, with a leftover of 2.5e-08.