A:
Positive:
1 x 18089897 x 25842713 x 13915391 x 19879103 x 17563193 x 9373721 x 25091339 x 1351
Negative:
-1 x -1808989-7 x -258427-13 x -139153-91 x -19879-103 x -17563-193 x -9373-721 x -2509-1339 x -1351
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 1,808,989, 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 | 1,808,989 | |
| -1 | -1,808,989 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 1,808,989.
Example:
1 x 1,808,989 = 1,808,989
and
-1 x -1,808,989 = 1,808,989
Notice both answers equal 1,808,989
With that explanation out of the way, let's continue. Next, we take the number 1,808,989 and divide it by 2:
1,808,989 ÷ 2 = 904,494.5
If the quotient is a whole number, then 2 and 904,494.5 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 | 1,808,989 | |
| -1 | -1,808,989 |
Now, we try dividing 1,808,989 by 3:
1,808,989 ÷ 3 = 602,996.3333
If the quotient is a whole number, then 3 and 602,996.3333 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 | 1,808,989 | |
| -1 | -1,808,989 |
Let's try dividing by 4:
1,808,989 ÷ 4 = 452,247.25
If the quotient is a whole number, then 4 and 452,247.25 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 | 1,808,989 | |
| -1 | 1,808,989 |
If you did it right, you will end up with this table:
| 1 | 7 | 13 | 91 | 103 | 193 | 721 | 1,339 | 1,351 | 2,509 | 9,373 | 17,563 | 19,879 | 139,153 | 258,427 | 1,808,989 |
| -1 | -7 | -13 | -91 | -103 | -193 | -721 | -1,339 | -1,351 | -2,509 | -9,373 | -17,563 | -19,879 | -139,153 | -258,427 | -1,808,989 |
Here are some more numbers to try:
Try the factor calculator