389311978 has 16 divisors (see below), whose sum is σ = 638707680. Its totient is φ = 176501200.

The previous prime is 389311973. The next prime is 389311987. The reversal of 389311978 is 879113983.

It is not an unprimeable number, because it can be changed into a prime (389311973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14188 + ... + 31303.

It is an arithmetic number, because the mean of its divisors is an integer number (39919230).

Almost surely, 2^389311978 is an apocalyptic number.

389311978 is a deficient number, since it is larger than the sum of its proper divisors (249395702).

389311978 is a wasteful number, since it uses less digits than its factorization.

389311978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45893.

The product of its digits is 326592, while the sum is 49.

The square root of 389311978 is about 19730.9902944581. The cubic root of 389311978 is about 730.1844645488.

The spelling of 389311978 in words is "three hundred eighty-nine million, three hundred eleven thousand, nine hundred seventy-eight".