389627978 has 8 divisors (see below), whose sum is σ = 592673760. Its totient is φ = 192070060.

The previous prime is 389627941. The next prime is 389627983. The reversal of 389627978 is 879726983.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×389627978² = 303619922480736968, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1371788 + ... + 1372071.

It is an arithmetic number, because the mean of its divisors is an integer number (74084220).

Almost surely, 2^389627978 is an apocalyptic number.

389627978 is a deficient number, since it is larger than the sum of its proper divisors (203045782).

389627978 is a wasteful number, since it uses less digits than its factorization.

389627978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2743932.

The product of its digits is 9144576, while the sum is 59.

The square root of 389627978 is about 19738.9963777290. The cubic root of 389627978 is about 730.3819718633.

The spelling of 389627978 in words is "three hundred eighty-nine million, six hundred twenty-seven thousand, nine hundred seventy-eight".