399329 has 4 divisors (see below), whose sum is σ = 456384. Its totient is φ = 342276.

The previous prime is 399283. The next prime is 399353. The reversal of 399329 is 923993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 399329 - 2¹⁶ = 333793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28517 + ... + 28530.

It is an arithmetic number, because the mean of its divisors is an integer number (114096).

2³⁹⁹³²⁹ is an apocalyptic number.

It is an amenable number.

399329 is a deficient number, since it is larger than the sum of its proper divisors (57055).

399329 is an equidigital number, since it uses as much as digits as its factorization.

399329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57054.

The product of its digits is 13122, while the sum is 35.

The square root of 399329 is about 631.9248373027. The cubic root of 399329 is about 73.6394071615.

The spelling of 399329 in words is "three hundred ninety-nine thousand, three hundred twenty-nine".