3 x 7 x 19 = 399
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1, 3, 7, 19, 21, 57, 133, and 399. The prime factors of 399 are 3, 7, and 19.
The factors of 399 are: 1, 3, 7, 19, 21, 57, 133, 399.
1, 3, 5, 7, 15, 19, 21, 35, 57, 95, 105, 133, 285, 399, 665, 1995 3, 5, 7 and 19 are prime.
The common factors are: 1, 3
it is when you "factor tree" a number down until it cn non longer be broken down.2 factors of 84 are 4 and 21 because when you multiply them, you get 84. factor 4 down into 2 and 2. factor 21 down into 3 and 7. in this case, the prime factorization is two to the second power times three times seven.