639491 divided by 1 
Let's see how many times 1 fits into 639491.

Moving on to step 1:
1 can be fit into 6 6 times, resulting in a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 6.0
The remainder is 0 after subtracting 6 from 6.
Fetch the next digit (3) from the dividend, attach it to 0 and continue: 3 / 1

Moving on to step 2:
When dividing 3 by 1, we get 3 with a remainder of 0.
The next digit of our result is 3. 
Result so far: 63.0
Deduct 3 from 3 and we're left with 0.
Fetch the next digit (9) from the dividend, attach it to 0 and continue: 9 / 1

On to step 3:
9 divided by 1 is 9 with a remainder of 0.
Put 9 as the next digit of the answer. 
Result so far: 639.0
If we subtract 9 from 9, we get 0.
Take the next digit (4) from the dividend and append it to 0, then repeat: 4 / 1

Going ahead to step 4:
The number 1 fits into 4 4 times, leaving a remainder of 0.
Use 4 as the next digit of our solution. 
Result so far: 6394.0
Subtracting 4 from 4 leaves us with 0.
Fetch the next digit (9) from the dividend, attach it to 0 and continue: 9 / 1

On to step 5:
1 goes into 9 9 times with a remainder of 0.
The next digit of our result is 9. 
Result so far: 63949.0
The remainder is 0 after subtracting 9 from 9.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 1

Moving on to step 6:
If we divide 1 by 1, we get 1 and a remainder of 0.
Record the quotient 1 as the next digit in the result. 
Result so far: 639491.0
If we take 1 away from 1, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 7:
If we divide 0 by 1, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 639491.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 8:
1 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 639491.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 639491.0 and a remainder of 0.0.