390870988 has 48 divisors (see below), whose sum is σ = 718502400. Its totient is φ = 185906240.

The previous prime is 390870979. The next prime is 390871003. The reversal of 390870988 is 889078093.

It is a super-2 number, since 2×390870988² = 305560258520192288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1452918 + ... + 1453186.

It is an arithmetic number, because the mean of its divisors is an integer number (14968800).

Almost surely, 2^390870988 is an apocalyptic number.

It is an amenable number.

390870988 is a deficient number, since it is larger than the sum of its proper divisors (327631412).

390870988 is a wasteful number, since it uses less digits than its factorization.

390870988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510 (or 508 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 390870988 is about 19770.4574555067. The cubic root of 390870988 is about 731.1578473203.

The spelling of 390870988 in words is "three hundred ninety million, eight hundred seventy thousand, nine hundred eighty-eight".