390657 has 8 divisors (see below), whose sum is σ = 526176. Its totient is φ = 257792.

The previous prime is 390653. The next prime is 390671. The reversal of 390657 is 756093.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 390657 - 2² = 390653 is a prime.

It is a super-2 number, since 2×390657² = 305225783298, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (390653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288 + ... + 929.

It is an arithmetic number, because the mean of its divisors is an integer number (65772).

2³⁹⁰⁶⁵⁷ is an apocalyptic number.

It is an amenable number.

390657 is a deficient number, since it is larger than the sum of its proper divisors (135519).

390657 is a wasteful number, since it uses less digits than its factorization.

390657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327.

The product of its (nonzero) digits is 5670, while the sum is 30.

The square root of 390657 is about 625.0255994757. The cubic root of 390657 is about 73.1024395303.

The spelling of 390657 in words is "three hundred ninety thousand, six hundred fifty-seven".