390218856 has 32 divisors (see below), whose sum is σ = 987305760. Its totient is φ = 128505152.

The previous prime is 390218839. The next prime is 390218887. The reversal of 390218856 is 658812093.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95955 + ... + 99938.

It is an arithmetic number, because the mean of its divisors is an integer number (30853305).

Almost surely, 2^390218856 is an apocalyptic number.

390218856 is the 12494-th centered pentagonal number.

It is an amenable number.

390218856 is an abundant number, since it is smaller than the sum of its proper divisors (597086904).

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

390218856 is a wasteful number, since it uses less digits than its factorization.

390218856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195985 (or 195981 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 390218856 is about 19753.9579831486. The cubic root of 390218856 is about 730.7509979490.

The spelling of 390218856 in words is "three hundred ninety million, two hundred eighteen thousand, eight hundred fifty-six".