389878818 has 32 divisors (see below), whose sum is σ = 910116864. Its totient is φ = 109023312.

The previous prime is 389878817. The next prime is 389878831. The reversal of 389878818 is 818878983.

It is not an unprimeable number, because it can be changed into a prime (389878817) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 96780 + ... + 100727.

It is an arithmetic number, because the mean of its divisors is an integer number (28441152).

Almost surely, 2^389878818 is an apocalyptic number.

389878818 is an abundant number, since it is smaller than the sum of its proper divisors (520238046).

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

389878818 is a wasteful number, since it uses less digits than its factorization.

389878818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197566.

The product of its digits is 6193152, while the sum is 60.

The square root of 389878818 is about 19745.3492752091. The cubic root of 389878818 is about 730.5386766534.

The spelling of 389878818 in words is "three hundred eighty-nine million, eight hundred seventy-eight thousand, eight hundred eighteen".