389888915 has 12 divisors (see below), whose sum is σ = 506625984. Its totient is φ = 287917344.

The previous prime is 389888909. The next prime is 389888921. The reversal of 389888915 is 519888983.

It is an interprime number because it is at equal distance from previous prime (389888909) and next prime (389888921).

It is not a de Polignac number, because 389888915 - 2⁴ = 389888899 is a prime.

It is a Duffinian number.

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, 229859 + ... + 231548.

It is an arithmetic number, because the mean of its divisors is an integer number (42218832).

Almost surely, 2^389888915 is an apocalyptic number.

389888915 is a deficient number, since it is larger than the sum of its proper divisors (116737069).

389888915 is a wasteful number, since it uses less digits than its factorization.

389888915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461438 (or 461425 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 59.

The square root of 389888915 is about 19745.6049540145. The cubic root of 389888915 is about 730.5449830449.

The spelling of 389888915 in words is "three hundred eighty-nine million, eight hundred eighty-eight thousand, nine hundred fifteen".