A:
Positive:
1 x 12878397 x 18397719 x 6778123 x 55993133 x 9683161 x 7999421 x 3059437 x 2947
Negative:
-1 x -1287839-7 x -183977-19 x -67781-23 x -55993-133 x -9683-161 x -7999-421 x -3059-437 x -2947
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 1,287,839, 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 | 1,287,839 | |
| -1 | -1,287,839 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 1,287,839.
Example:
1 x 1,287,839 = 1,287,839
and
-1 x -1,287,839 = 1,287,839
Notice both answers equal 1,287,839
With that explanation out of the way, let's continue. Next, we take the number 1,287,839 and divide it by 2:
1,287,839 ÷ 2 = 643,919.5
If the quotient is a whole number, then 2 and 643,919.5 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 | 1,287,839 | |
| -1 | -1,287,839 |
Now, we try dividing 1,287,839 by 3:
1,287,839 ÷ 3 = 429,279.6667
If the quotient is a whole number, then 3 and 429,279.6667 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 | 1,287,839 | |
| -1 | -1,287,839 |
Let's try dividing by 4:
1,287,839 ÷ 4 = 321,959.75
If the quotient is a whole number, then 4 and 321,959.75 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 | 1,287,839 | |
| -1 | 1,287,839 |
If you did it right, you will end up with this table:
| 1 | 7 | 19 | 23 | 133 | 161 | 421 | 437 | 2,947 | 3,059 | 7,999 | 9,683 | 55,993 | 67,781 | 183,977 | 1,287,839 |
| -1 | -7 | -19 | -23 | -133 | -161 | -421 | -437 | -2,947 | -3,059 | -7,999 | -9,683 | -55,993 | -67,781 | -183,977 | -1,287,839 |
Here are some more numbers to try:
Try the factor calculator