Q: What are the prime factors of the number 413,440?

 A: 2, 5, 17, 19

Why are those the prime factors of the number 413,440?

Prime factors are the prime numbers that can be multipled together to equal the original number. You find the factors by dividing by prime numbers. It is best shown by creating a Factor Tree.

Factor Tree for the number 413,440

413,440
Factor Arrows
2206,720
Factor Arrows
2103,360
Factor Arrows
251,680
Factor Arrows
225,840
Factor Arrows
212,920
Factor Arrows
26,460
Factor Arrows
23,230
Factor Arrows
21,615
Factor Arrows
5323
Factor Arrows
1719

The numbers in bold above are the prime factors. If there are multiples, you only count them one time. This leads us to our prime factors of:

2, 5, 17, 19

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 5 x 17 x 19 = 413,440

This can also be written as 28 x 51 x 171 x 191 = 413,440

If you would like to know more, or need additional explanation, please review our prime factorization explanation.


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