389911638 has 16 divisors (see below), whose sum is σ = 787112640. Its totient is φ = 128755656.

The previous prime is 389911633. The next prime is 389911651. The reversal of 389911638 is 836119983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389911631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 303028 + ... + 304311.

It is an arithmetic number, because the mean of its divisors is an integer number (49194540).

Almost surely, 2^389911638 is an apocalyptic number.

389911638 is an abundant number, since it is smaller than the sum of its proper divisors (397201002).

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

389911638 is a wasteful number, since it uses less digits than its factorization.

389911638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607451.

The product of its digits is 279936, while the sum is 48.

The square root of 389911638 is about 19746.1803394986. The cubic root of 389911638 is about 730.5591749942.

The spelling of 389911638 in words is "three hundred eighty-nine million, nine hundred eleven thousand, six hundred thirty-eight".