388720716 has 12 divisors (see below), whose sum is σ = 907015032. Its totient is φ = 129573568.

The previous prime is 388720681. The next prime is 388720729. The reversal of 388720716 is 617027883.

388720716 = 6568² + 6569² + ... + 6576².

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

It is a super-2 number, since 2×388720716² = 302207590095105312, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

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, 16196685 + ... + 16196708.

It is an arithmetic number, because the mean of its divisors is an integer number (75584586).

Almost surely, 2^388720716 is an apocalyptic number.

It is an amenable number.

388720716 is an abundant number, since it is smaller than the sum of its proper divisors (518294316).

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

388720716 is a wasteful number, since it uses less digits than its factorization.

388720716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32393400 (or 32393398 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 42.

The square root of 388720716 is about 19716.0015216068. The cubic root of 388720716 is about 729.8146248510.

The spelling of 388720716 in words is "three hundred eighty-eight million, seven hundred twenty thousand, seven hundred sixteen".