388617972 has 12 divisors (see below), whose sum is σ = 906775296. Its totient is φ = 129539320.

The previous prime is 388617947. The next prime is 388617973. The reversal of 388617972 is 279716883.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×388617972² = 302047856322785568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388617973) 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 3 ways as a sum of consecutive naturals, for example, 16192404 + ... + 16192427.

It is an arithmetic number, because the mean of its divisors is an integer number (75564608).

Almost surely, 2^388617972 is an apocalyptic number.

It is an amenable number.

388617972 is an abundant number, since it is smaller than the sum of its proper divisors (518157324).

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

388617972 is a wasteful number, since it uses less digits than its factorization.

388617972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32384838 (or 32384836 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 51.

The square root of 388617972 is about 19713.3957500985. The cubic root of 388617972 is about 729.7503193157.

The spelling of 388617972 in words is "three hundred eighty-eight million, six hundred seventeen thousand, nine hundred seventy-two".