390831087 has 8 divisors (see below), whose sum is σ = 529651120. Its totient is φ = 256282560.

The previous prime is 390831079. The next prime is 390831097. The reversal of 390831087 is 780138093.

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

It is not a de Polignac number, because 390831087 - 2³ = 390831079 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 (390831097) 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, 1067662 + ... + 1068027.

It is an arithmetic number, because the mean of its divisors is an integer number (66206390).

Almost surely, 2^390831087 is an apocalyptic number.

390831087 is a deficient number, since it is larger than the sum of its proper divisors (138820033).

390831087 is a wasteful number, since it uses less digits than its factorization.

390831087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135753.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 390831087 is about 19769.4483231070. The cubic root of 390831087 is about 731.1329670547.

The spelling of 390831087 in words is "three hundred ninety million, eight hundred thirty-one thousand, eighty-seven".