389309988 has 12 divisors (see below), whose sum is σ = 908390000. Its totient is φ = 129769992.

The previous prime is 389309971. The next prime is 389310001. The reversal of 389309988 is 889903983.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16221238 + ... + 16221261.

Almost surely, 2^389309988 is an apocalyptic number.

It is an amenable number.

389309988 is an abundant number, since it is smaller than the sum of its proper divisors (519080012).

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

389309988 is a wasteful number, since it uses less digits than its factorization.

389309988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32442506 (or 32442504 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 57.

The square root of 389309988 is about 19730.9398661088. The cubic root of 389309988 is about 730.1832204142.

The spelling of 389309988 in words is "three hundred eighty-nine million, three hundred nine thousand, nine hundred eighty-eight".