389978319 has 4 divisors (see below), whose sum is σ = 519971096. Its totient is φ = 259985544.

The previous prime is 389978311. The next prime is 389978321. The reversal of 389978319 is 913879983.

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

It is not a de Polignac number, because 389978319 - 2³ = 389978311 is a prime.

It is a super-2 number, since 2×389978319² = 304166178580131522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389978311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64996384 + ... + 64996389.

It is an arithmetic number, because the mean of its divisors is an integer number (129992774).

Almost surely, 2^389978319 is an apocalyptic number.

389978319 is a deficient number, since it is larger than the sum of its proper divisors (129992777).

389978319 is a wasteful number, since it uses less digits than its factorization.

389978319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129992776.

The product of its digits is 2939328, while the sum is 57.

The square root of 389978319 is about 19747.8687204468. The cubic root of 389978319 is about 730.6008183093.

The spelling of 389978319 in words is "three hundred eighty-nine million, nine hundred seventy-eight thousand, three hundred nineteen".