A:
Positive:
1 x 390087113 x 30006717 x 22946319 x 205309221 x 17651247 x 15793323 x 12077929 x 4199
Negative:
-1 x -3900871-13 x -300067-17 x -229463-19 x -205309-221 x -17651-247 x -15793-323 x -12077-929 x -4199
Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 3,900,871, it is easier to work with a table - it's called factoring from the outside in.
We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.
| 1 | 3,900,871 | |
| -1 | -3,900,871 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 3,900,871.
Example:
1 x 3,900,871 = 3,900,871
and
-1 x -3,900,871 = 3,900,871
Notice both answers equal 3,900,871
With that explanation out of the way, let's continue. Next, we take the number 3,900,871 and divide it by 2:
3,900,871 ÷ 2 = 1,950,435.5
If the quotient is a whole number, then 2 and 1,950,435.5 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 3,900,871 | |
| -1 | -3,900,871 |
Now, we try dividing 3,900,871 by 3:
3,900,871 ÷ 3 = 1,300,290.3333
If the quotient is a whole number, then 3 and 1,300,290.3333 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 3,900,871 | |
| -1 | -3,900,871 |
Let's try dividing by 4:
3,900,871 ÷ 4 = 975,217.75
If the quotient is a whole number, then 4 and 975,217.75 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 3,900,871 | |
| -1 | 3,900,871 |
If you did it right, you will end up with this table:
| 1 | 13 | 17 | 19 | 221 | 247 | 323 | 929 | 4,199 | 12,077 | 15,793 | 17,651 | 205,309 | 229,463 | 300,067 | 3,900,871 |
| -1 | -13 | -17 | -19 | -221 | -247 | -323 | -929 | -4,199 | -12,077 | -15,793 | -17,651 | -205,309 | -229,463 | -300,067 | -3,900,871 |
Here are some more numbers to try:
Try the factor calculator