Q: What are the prime factors of the number 382,976?

 A: 2, 11, 17

Why are those the prime factors of the number 382,976?

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 382,976

382,976
Factor Arrows
2191,488
Factor Arrows
295,744
Factor Arrows
247,872
Factor Arrows
223,936
Factor Arrows
211,968
Factor Arrows
25,984
Factor Arrows
22,992
Factor Arrows
21,496
Factor Arrows
2748
Factor Arrows
2374
Factor Arrows
2187
Factor Arrows
1117

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, 11, 17

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 2 x 2 x 2 x 11 x 17 = 382,976

This can also be written as 211 x 111 x 171 = 382,976

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


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