390664 has 16 divisors (see below), whose sum is σ = 748800. Its totient is φ = 190992.

The previous prime is 390653. The next prime is 390671. The reversal of 390664 is 466093.

390664 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam 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, 144 + ... + 895.

It is an arithmetic number, because the mean of its divisors is an integer number (46800).

2³⁹⁰⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

390664 is a deficient number, since it is larger than the sum of its proper divisors (358136).

390664 is a wasteful number, since it uses less digits than its factorization.

390664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092 (or 1088 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 390664 is about 625.0311992213. The cubic root of 390664 is about 73.1028761571.

The spelling of 390664 in words is "three hundred ninety thousand, six hundred sixty-four".