399704 has 16 divisors (see below), whose sum is σ = 793800. Its totient is φ = 188032.

The previous prime is 399691. The next prime is 399719. The reversal of 399704 is 407993.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1334 + ... + 1605.

2³⁹⁹⁷⁰⁴ is an apocalyptic number.

399704 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

399704 is a deficient number, since it is larger than the sum of its proper divisors (394096).

399704 is a wasteful number, since it uses less digits than its factorization.

399704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2962 (or 2958 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 399704 is about 632.2214801792. The cubic root of 399704 is about 73.6624509325.

The spelling of 399704 in words is "three hundred ninety-nine thousand, seven hundred four".