A:
Positive:
1 x 1239892129 x 42754943 x 28834761 x 203261163 x 760671247 x 99431769 x 70092623 x 4727
Negative:
-1 x -12398921-29 x -427549-43 x -288347-61 x -203261-163 x -76067-1247 x -9943-1769 x -7009-2623 x -4727
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 12,398,921, 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 | 12,398,921 | |
| -1 | -12,398,921 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 12,398,921.
Example:
1 x 12,398,921 = 12,398,921
and
-1 x -12,398,921 = 12,398,921
Notice both answers equal 12,398,921
With that explanation out of the way, let's continue. Next, we take the number 12,398,921 and divide it by 2:
12,398,921 ÷ 2 = 6,199,460.5
If the quotient is a whole number, then 2 and 6,199,460.5 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 | 12,398,921 | |
| -1 | -12,398,921 |
Now, we try dividing 12,398,921 by 3:
12,398,921 ÷ 3 = 4,132,973.6667
If the quotient is a whole number, then 3 and 4,132,973.6667 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 | 12,398,921 | |
| -1 | -12,398,921 |
Let's try dividing by 4:
12,398,921 ÷ 4 = 3,099,730.25
If the quotient is a whole number, then 4 and 3,099,730.25 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 | 12,398,921 | |
| -1 | 12,398,921 |
If you did it right, you will end up with this table:
| 1 | 29 | 43 | 61 | 163 | 1,247 | 1,769 | 2,623 | 4,727 | 7,009 | 9,943 | 76,067 | 203,261 | 288,347 | 427,549 | 12,398,921 |
| -1 | -29 | -43 | -61 | -163 | -1,247 | -1,769 | -2,623 | -4,727 | -7,009 | -9,943 | -76,067 | -203,261 | -288,347 | -427,549 | -12,398,921 |
Here are some more numbers to try:
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