A:
Positive:
1 x 23917817 x 34168317 x 140693101 x 23681119 x 20099199 x 12019707 x 33831393 x 1717
Negative:
-1 x -2391781-7 x -341683-17 x -140693-101 x -23681-119 x -20099-199 x -12019-707 x -3383-1393 x -1717
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 2,391,781, 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 | 2,391,781 | |
| -1 | -2,391,781 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 2,391,781.
Example:
1 x 2,391,781 = 2,391,781
and
-1 x -2,391,781 = 2,391,781
Notice both answers equal 2,391,781
With that explanation out of the way, let's continue. Next, we take the number 2,391,781 and divide it by 2:
2,391,781 ÷ 2 = 1,195,890.5
If the quotient is a whole number, then 2 and 1,195,890.5 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 | 2,391,781 | |
| -1 | -2,391,781 |
Now, we try dividing 2,391,781 by 3:
2,391,781 ÷ 3 = 797,260.3333
If the quotient is a whole number, then 3 and 797,260.3333 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 | 2,391,781 | |
| -1 | -2,391,781 |
Let's try dividing by 4:
2,391,781 ÷ 4 = 597,945.25
If the quotient is a whole number, then 4 and 597,945.25 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 | 2,391,781 | |
| -1 | 2,391,781 |
If you did it right, you will end up with this table:
| 1 | 7 | 17 | 101 | 119 | 199 | 707 | 1,393 | 1,717 | 3,383 | 12,019 | 20,099 | 23,681 | 140,693 | 341,683 | 2,391,781 |
| -1 | -7 | -17 | -101 | -119 | -199 | -707 | -1,393 | -1,717 | -3,383 | -12,019 | -20,099 | -23,681 | -140,693 | -341,683 | -2,391,781 |
Here are some more numbers to try:
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