390875931 has 12 divisors (see below), whose sum is σ = 582811840. Its totient is φ = 252177840.

The previous prime is 390875929. The next prime is 390875957. The reversal of 390875931 is 139578093.

It is a happy number.

It is not a de Polignac number, because 390875931 - 2¹ = 390875929 is a prime.

It is a super-2 number, since 2×390875931² = 305567986870233522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390875911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 700216 + ... + 700773.

Almost surely, 2^390875931 is an apocalyptic number.

390875931 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

390875931 is a deficient number, since it is larger than the sum of its proper divisors (191935909).

390875931 is a wasteful number, since it uses less digits than its factorization.

390875931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1401026 (or 1401023 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 390875931 is about 19770.5824648643. The cubic root of 390875931 is about 731.1609294097.

The spelling of 390875931 in words is "three hundred ninety million, eight hundred seventy-five thousand, nine hundred thirty-one".