389378018 has 4 divisors (see below), whose sum is σ = 584067030. Its totient is φ = 194689008.

The previous prime is 389378009. The next prime is 389378021. The reversal of 389378018 is 810873983.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 230037889 + 159340129 = 15167^2 + 12623^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97344503 + ... + 97344506.

Almost surely, 2^389378018 is an apocalyptic number.

389378018 is a deficient number, since it is larger than the sum of its proper divisors (194689012).

389378018 is a wasteful number, since it uses less digits than its factorization.

389378018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194689011.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 389378018 is about 19732.6637330088. The cubic root of 389378018 is about 730.2257499090.

The spelling of 389378018 in words is "three hundred eighty-nine million, three hundred seventy-eight thousand, eighteen".