Let's divide 536391 by 39
The aim is to understand the frequency of 39 in 536391.

Advancing to step 1:
When dividing 5 by 39, we get 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Bring next digit (3) of the dividend behind the 5 and repeat the process: 53 / 39

Step 2:
If we divide 53 by 39, we get 1 and a remainder of 14.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 39 away from 53, we end up with 14.
Include the next digit (6) from the dividend after 14, then repeat: 146 / 39

Advancing to step 3:
146 divided by 39 is 3 with a remainder of 29.
Use 3 as the next digit of our solution. 
Result so far: 13.0
Deduct 117 from 146 and we're left with 29.
Fetch the next digit (3) from the dividend, attach it to 29 and continue: 293 / 39

Advancing to step 4:
39 can be fit into 293 7 times, resulting in a remainder of 20.
Use 7 as the next digit of our solution. 
Result so far: 137.0
Subtracting 273 from 293 leaves us with 20.
Take the next digit (9) from the dividend and append it to 20, then repeat: 209 / 39

Let's proceed to step 5:
When dividing 209 by 39, we get 5 with a remainder of 14.
Write down 5 as next digit of the result. 
Result so far: 1375.0
If we take 195 away from 209, we end up with 14.
Take the next digit (1) from the dividend and append it to 14, then repeat: 141 / 39

Moving on to step 6:
If we divide 141 by 39, we get 3 and a remainder of 24.
Record the quotient 3 as the next digit in the result. 
Result so far: 13753.0
Subtracting 117 from 141 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 7:
If we divide 240 by 39, we get 6 and a remainder of 6.
The next digit of our result is 6. 
Result so far: 13753.6
The remainder is 6 after subtracting 234 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 8:
When dividing 60 by 39, we get 1 with a remainder of 21.
The next digit of our result is 1. 
Result so far: 13753.61
Deduct 39 from 60 and we're left with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Step 9:
39 can be fit into 210 5 times, resulting in a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 13753.615
The remainder is 15 after subtracting 195 from 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 10:
The number 39 fits into 150 3 times, leaving a remainder of 33.
The next digit of our result is 3. 
Result so far: 13753.6153
The remainder is 33 after subtracting 117 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Advancing to step 11:
The number 39 fits into 330 8 times, leaving a remainder of 18.
Put 8 as the next digit of the answer. 
Result so far: 13753.61538
The remainder is 18 after subtracting 312 from 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 12:
The number 39 fits into 180 4 times, leaving a remainder of 24.
The next digit of our result is 4. 
Result so far: 13753.615384
If we subtract 156 from 180, we get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 13:
39 can be fit into 240 6 times, resulting in a remainder of 6.
The number 6 becomes the next digit in our result. 
Result so far: 13753.6153846
Subtracting 234 from 240 leaves us 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.

Going ahead to step 14:
39 goes into 60 1 times with a remainder of 21.
Write down 1 as next digit of the result. 
Result so far: 13753.61538461
If we subtract 39 from 60, we 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.

The final result is 13753.61538461 with a remainder of 2.1e-08.