Q: What are the factor combinations of the number 402,840?

 A:
Positive:   1 x 4028402 x 2014203 x 1342804 x 1007105 x 805686 x 671408 x 503559 x 4476010 x 4028412 x 3357015 x 2685618 x 2238020 x 2014224 x 1678527 x 1492030 x 1342836 x 1119040 x 1007145 x 895254 x 746060 x 671472 x 559590 x 4476108 x 3730120 x 3357135 x 2984180 x 2238216 x 1865270 x 1492360 x 1119373 x 1080540 x 746
Negative: -1 x -402840-2 x -201420-3 x -134280-4 x -100710-5 x -80568-6 x -67140-8 x -50355-9 x -44760-10 x -40284-12 x -33570-15 x -26856-18 x -22380-20 x -20142-24 x -16785-27 x -14920-30 x -13428-36 x -11190-40 x -10071-45 x -8952-54 x -7460-60 x -6714-72 x -5595-90 x -4476-108 x -3730-120 x -3357-135 x -2984-180 x -2238-216 x -1865-270 x -1492-360 x -1119-373 x -1080-540 x -746


How do I find the factor combinations of the number 402,840?

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 402,840, it is easier to work with a table - it's called factoring from the outside in.

Outside in Factoring

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.

1 402,840
-1 -402,840

Why are the negative numbers included?

When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 402,840.

Example:
1 x 402,840 = 402,840
and
-1 x -402,840 = 402,840
Notice both answers equal 402,840

With that explanation out of the way, let's continue. Next, we take the number 402,840 and divide it by 2:

402,840 ÷ 2 = 201,420

If the quotient is a whole number, then 2 and 201,420 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!

Here is what our table should look like at this step:

1 2 201,420 402,840
-1 -2 -201,420 -402,840

Now, we try dividing 402,840 by 3:

402,840 ÷ 3 = 134,280

If the quotient is a whole number, then 3 and 134,280 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!

Here is what our table should look like at this step:

1 2 3 134,280 201,420 402,840
-1 -2 -3 -134,280 -201,420 -402,840

Let's try dividing by 4:

402,840 ÷ 4 = 100,710

If the quotient is a whole number, then 4 and 100,710 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!

Here is what our table should look like at this step:

1 2 3 4 100,710 134,280 201,420 402,840
-1 -2 -3 -4 -100,710 -134,280 -201,420 402,840
Keep dividing by the next highest number until you cannot divide anymore.

If you did it right, you will end up with this table:

123456891012151820242730364045546072901081201351802162703603735407461,0801,1191,4921,8652,2382,9843,3573,7304,4765,5956,7147,4608,95210,07111,19013,42814,92016,78520,14222,38026,85633,57040,28444,76050,35567,14080,568100,710134,280201,420402,840
-1-2-3-4-5-6-8-9-10-12-15-18-20-24-27-30-36-40-45-54-60-72-90-108-120-135-180-216-270-360-373-540-746-1,080-1,119-1,492-1,865-2,238-2,984-3,357-3,730-4,476-5,595-6,714-7,460-8,952-10,071-11,190-13,428-14,920-16,785-20,142-22,380-26,856-33,570-40,284-44,760-50,355-67,140-80,568-100,710-134,280-201,420-402,840

More Examples

Here are some more numbers to try:

402,838402,839402,841402,842
Try the factor calculator

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