We look at the division of 84023674 by 391 
The aim is to understand the frequency of 391 in 84023674.

On to step 1:
When dividing 8 by 391, we get 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Fetch the next digit (4) from the dividend, attach it to 8 and continue: 84 / 391

On to step 2:
391 can be fit into 84 0 times, resulting in a remainder of 84.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 84 and we're left with 84.
Fetch the next digit (0) from the dividend, attach it to 84 and continue: 840 / 391

Let's proceed to step 3:
The number 391 fits into 840 2 times, leaving a remainder of 58.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtract 782 from 840 to get 58.
Fetch the next digit (2) from the dividend, attach it to 58 and continue: 582 / 391

Advancing to step 4:
391 can be fit into 582 1 times, resulting in a remainder of 191.
Write down 1 as next digit of the result. 
Result so far: 21.0
Subtract 391 from 582 to get 191.
Append the next digit (3) from the dividend to 191 and continue with: 1913 / 391

Going ahead to step 5:
1913 divided by 391 is 4 with a remainder of 349.
The number 4 becomes the next digit in our result. 
Result so far: 214.0
Subtract 1564 from 1913 to get 349.
Fetch the next digit (6) from the dividend, attach it to 349 and continue: 3496 / 391

Moving on to step 6:
When dividing 3496 by 391, we get 8 with a remainder of 368.
Use 8 as the next digit of our solution. 
Result so far: 2148.0
Subtract 3128 from 3496 to get 368.
Append the next digit (7) from the dividend to 368 and continue with: 3687 / 391

Let's proceed to step 7:
3687 divided by 391 is 9 with a remainder of 168.
Put 9 as the next digit of the answer. 
Result so far: 21489.0
If we subtract 3519 from 3687, we get 168.
Take the next digit (4) from the dividend and append it to 168, then repeat: 1684 / 391

Advancing to step 8:
The number 391 fits into 1684 4 times, leaving a remainder of 120.
The number 4 becomes the next digit in our result. 
Result so far: 214894.0
Subtracting 1564 from 1684 leaves us 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.

Step 9:
The number 391 fits into 1200 3 times, leaving a remainder of 27.
Record the quotient 3 as the next digit in the result. 
Result so far: 214894.3
Subtract 1173 from 1200 to get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Let's proceed to step 10:
270 divided by 391 is 0 with a remainder of 270.
Put 0 as the next digit of the answer. 
Result so far: 214894.3
Deduct 0 from 270 and we're left with 270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2700, and continue the process.

Step 11:
391 can be fit into 2700 6 times, resulting in a remainder of 354.
The number 6 becomes the next digit in our result. 
Result so far: 214894.306
Subtracting 2346 from 2700 leaves us with 354.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3540, and continue the process.

Step 12:
391 goes into 3540 9 times with a remainder of 21.
Use 9 as the next digit of our solution. 
Result so far: 214894.3069
Subtract 3519 from 3540 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.

Going ahead to step 13:
If we divide 210 by 391, we get 0 and a remainder of 210.
Write down 0 as next digit of the result. 
Result so far: 214894.3069
If we take 0 away from 210, we end up 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.

Advancing to step 14:
391 goes into 2100 5 times with a remainder of 145.
The number 5 becomes the next digit in our result. 
Result so far: 214894.306905
Subtracting 1955 from 2100 leaves us with 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

Let's proceed to step 15:
391 goes into 1450 3 times with a remainder of 277.
The number 3 becomes the next digit in our result. 
Result so far: 214894.3069053
Subtract 1173 from 1450 to get 277.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2770, and continue the process.

Let's proceed to step 16:
When dividing 2770 by 391, we get 7 with a remainder of 33.
Write down 7 as next digit of the result. 
Result so far: 214894.30690537
Subtracting 2737 from 2770 leaves us with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

In conclusion, the division gives 214894.30690537 with a balance of 3.3e-08.