390449988 has 36 divisors (see below), whose sum is σ = 991339440. Its totient is φ = 129573936.

The previous prime is 390449971. The next prime is 390450007. The reversal of 390449988 is 889944093.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15718 + ... + 32061.

Almost surely, 2^390449988 is an apocalyptic number.

It is an amenable number.

390449988 is an abundant number, since it is smaller than the sum of its proper divisors (600889452).

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

390449988 is a wasteful number, since it uses less digits than its factorization.

390449988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48016 (or 48011 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The square root of 390449988 is about 19759.8073877252. The cubic root of 390449988 is about 730.8952474308.

The spelling of 390449988 in words is "three hundred ninety million, four hundred forty-nine thousand, nine hundred eighty-eight".