391290888 has 16 divisors (see below), whose sum is σ = 978227280. Its totient is φ = 130430288.

The previous prime is 391290859. The next prime is 391290899. The reversal of 391290888 is 888092193.

It is a happy 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, 8151870 + ... + 8151917.

It is an arithmetic number, because the mean of its divisors is an integer number (61139205).

Almost surely, 2^391290888 is an apocalyptic number.

It is an amenable number.

391290888 is an abundant number, since it is smaller than the sum of its proper divisors (586936392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

391290888 is a wasteful number, since it uses less digits than its factorization.

391290888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16303796 (or 16303792 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 48.

The square root of 391290888 is about 19781.0739849989. The cubic root of 391290888 is about 731.4195733262.

The spelling of 391290888 in words is "three hundred ninety-one million, two hundred ninety thousand, eight hundred eighty-eight".