A:
Positive:
1 x 3989055 x 7978113 x 3068517 x 2346519 x 2099565 x 613785 x 469395 x 4199221 x 1805247 x 1615323 x 1235361 x 1105
Negative:
-1 x -398905-5 x -79781-13 x -30685-17 x -23465-19 x -20995-65 x -6137-85 x -4693-95 x -4199-221 x -1805-247 x -1615-323 x -1235-361 x -1105
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 398,905, 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 | 398,905 | |
| -1 | -398,905 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 398,905.
Example:
1 x 398,905 = 398,905
and
-1 x -398,905 = 398,905
Notice both answers equal 398,905
With that explanation out of the way, let's continue. Next, we take the number 398,905 and divide it by 2:
398,905 ÷ 2 = 199,452.5
If the quotient is a whole number, then 2 and 199,452.5 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 | 398,905 | |
| -1 | -398,905 |
Now, we try dividing 398,905 by 3:
398,905 ÷ 3 = 132,968.3333
If the quotient is a whole number, then 3 and 132,968.3333 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 | 398,905 | |
| -1 | -398,905 |
Let's try dividing by 4:
398,905 ÷ 4 = 99,726.25
If the quotient is a whole number, then 4 and 99,726.25 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 | 398,905 | |
| -1 | 398,905 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 17 | 19 | 65 | 85 | 95 | 221 | 247 | 323 | 361 | 1,105 | 1,235 | 1,615 | 1,805 | 4,199 | 4,693 | 6,137 | 20,995 | 23,465 | 30,685 | 79,781 | 398,905 |
| -1 | -5 | -13 | -17 | -19 | -65 | -85 | -95 | -221 | -247 | -323 | -361 | -1,105 | -1,235 | -1,615 | -1,805 | -4,199 | -4,693 | -6,137 | -20,995 | -23,465 | -30,685 | -79,781 | -398,905 |
Here are some more numbers to try:
Try the factor calculator