389429978 has 16 divisors (see below), whose sum is σ = 678539904. Its totient is φ = 164162160.

The previous prime is 389429969. The next prime is 389429993. The reversal of 389429978 is 879924983.

It is a Curzon number.

It is an unprimeable number.

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, 227150 + ... + 228857.

It is an arithmetic number, because the mean of its divisors is an integer number (42408744).

Almost surely, 2^389429978 is an apocalyptic number.

389429978 is a deficient number, since it is larger than the sum of its proper divisors (289109926).

389429978 is a wasteful number, since it uses less digits than its factorization.

389429978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456077.

The product of its digits is 7838208, while the sum is 59.

The square root of 389429978 is about 19733.9802878183. The cubic root of 389429978 is about 730.2582297791.

The spelling of 389429978 in words is "three hundred eighty-nine million, four hundred twenty-nine thousand, nine hundred seventy-eight".