Number 399 is not a prime number. It is a composite number.

A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers. We do not consider 399 as a prime number, because it can be written as a product of two smaller natural numbers (check the factors of number 399 below).

Number of factors: 8.

List of factors/divisors: 1, 3, 7, 19, 21, 57, 133, 399.

Parity: 399 is an odd number.

Perfect square: no (a square number or perfect square is an integer that is the square of an integer).

Perfect number: no, because the sum of its proper divisors is 241 (perfect number is a positive integer that is equal to the sum of its proper divisors).

Number: Prime number: | 392 no | 393 no | 394 no | 395 no | 396 no | 397 yes | 398 no | 399 no | 400 no | 401 yes | 402 no | 403 no | 404 no | 405 no | 406 no |
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