390831287 has 16 divisors (see below), whose sum is σ = 488025600. Its totient is φ = 304071840.

The previous prime is 390831263. The next prime is 390831293. The reversal of 390831287 is 782138093.

It is a cyclic number.

It is not a de Polignac number, because 390831287 - 2⁶ = 390831223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390831187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51014 + ... + 58172.

It is an arithmetic number, because the mean of its divisors is an integer number (30501600).

Almost surely, 2^390831287 is an apocalyptic number.

390831287 is a deficient number, since it is larger than the sum of its proper divisors (97194313).

390831287 is a wasteful number, since it uses less digits than its factorization.

390831287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7886.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 390831287 is about 19769.4533814165. The cubic root of 390831287 is about 731.1330917689.

The spelling of 390831287 in words is "three hundred ninety million, eight hundred thirty-one thousand, two hundred eighty-seven".