388415920 has 40 divisors (see below), whose sum is σ = 904897440. Its totient is φ = 155051520.

The previous prime is 388415897. The next prime is 388415977. The reversal of 388415920 is 29514883.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37021 + ... + 46339.

It is an arithmetic number, because the mean of its divisors is an integer number (22622436).

Almost surely, 2^388415920 is an apocalyptic number.

It is an amenable number.

388415920 is an abundant number, since it is smaller than the sum of its proper divisors (516481520).

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

388415920 is a wasteful number, since it uses less digits than its factorization.

388415920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9853 (or 9847 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 388415920 is about 19708.2703452129. The cubic root of 388415920 is about 729.6238257038.

The spelling of 388415920 in words is "three hundred eighty-eight million, four hundred fifteen thousand, nine hundred twenty".