388920978 has 24 divisors (see below), whose sum is σ = 869846016. Its totient is φ = 125458200.

The previous prime is 388920977. The next prime is 388920989. The reversal of 388920978 is 879029883.

It is not an unprimeable number, because it can be changed into a prime (388920971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 347938 + ... + 349053.

It is an arithmetic number, because the mean of its divisors is an integer number (36243584).

Almost surely, 2^388920978 is an apocalyptic number.

388920978 is an abundant number, since it is smaller than the sum of its proper divisors (480925038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

388920978 is a wasteful number, since it uses less digits than its factorization.

388920978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697030 (or 697027 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The square root of 388920978 is about 19721.0795343460. The cubic root of 388920978 is about 729.9399325067.

The spelling of 388920978 in words is "three hundred eighty-eight million, nine hundred twenty thousand, nine hundred seventy-eight".