86149586 ÷ 398 
We want to divide 86149586 by 398.

Let's proceed to step 1:
8 divided by 398 is 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 398

Advancing to step 2:
398 goes into 86 0 times with a remainder of 86.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 86 leaves us with 86.
Include the next digit (1) from the dividend after 86, then repeat: 861 / 398

Step 3:
The number 398 fits into 861 2 times, leaving a remainder of 65.
The next digit of our result is 2. 
Result so far: 2.0
Deduct 796 from 861 and we're left with 65.
Fetch the next digit (4) from the dividend, attach it to 65 and continue: 654 / 398

On to step 4:
398 goes into 654 1 times with a remainder of 256.
The number 1 becomes the next digit in our result. 
Result so far: 21.0
Deduct 398 from 654 and we're left with 256.
Include the next digit (9) from the dividend after 256, then repeat: 2569 / 398

On to step 5:
398 can be fit into 2569 6 times, resulting in a remainder of 181.
The next digit of our result is 6. 
Result so far: 216.0
Subtract 2388 from 2569 to get 181.
Fetch the next digit (5) from the dividend, attach it to 181 and continue: 1815 / 398

On to step 6:
The number 398 fits into 1815 4 times, leaving a remainder of 223.
Record the quotient 4 as the next digit in the result. 
Result so far: 2164.0
If we take 1592 away from 1815, we end up with 223.
Bring next digit (8) of the dividend behind the 223 and repeat the process: 2238 / 398

Let's proceed to step 7:
398 goes into 2238 5 times with a remainder of 248.
Write down 5 as next digit of the result. 
Result so far: 21645.0
The remainder is 248 after subtracting 1990 from 2238.
Grab the next digit (6) from the dividend, add it to 248, then carry on: 2486 / 398

Advancing to step 8:
398 can be fit into 2486 6 times, resulting in a remainder of 98.
The next digit of our result is 6. 
Result so far: 216456.0
Subtract 2388 from 2486 to get 98.
Since there are no more digits in the dividend, we add a zero to the remainder making it 980, and continue the process.

Step 9:
The number 398 fits into 980 2 times, leaving a remainder of 184.
Use 2 as the next digit of our solution. 
Result so far: 216456.2
If we take 796 away from 980, we end up with 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

Advancing to step 10:
398 goes into 1840 4 times with a remainder of 248.
Write down 4 as next digit of the result. 
Result so far: 216456.24
Subtracting 1592 from 1840 leaves us with 248.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

Moving on to step 11:
The number 398 fits into 2480 6 times, leaving a remainder of 92.
The number 6 becomes the next digit in our result. 
Result so far: 216456.246
Subtract 2388 from 2480 to get 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

Moving on to step 12:
The number 398 fits into 920 2 times, leaving a remainder of 124.
The next digit of our result is 2. 
Result so far: 216456.2462
The remainder is 124 after subtracting 796 from 920.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

On to step 13:
398 goes into 1240 3 times with a remainder of 46.
Write down 3 as next digit of the result. 
Result so far: 216456.24623
Subtract 1194 from 1240 to get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Advancing to step 14:
398 can be fit into 460 1 times, resulting in a remainder of 62.
The number 1 becomes the next digit in our result. 
Result so far: 216456.246231
Subtract 398 from 460 to get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Let's proceed to step 15:
398 goes into 620 1 times with a remainder of 222.
Record the quotient 1 as the next digit in the result. 
Result so far: 216456.2462311
The remainder is 222 after subtracting 398 from 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2220, and continue the process.

The final outcome is 216456.2462311, with a leftover of 2.22e-06.