388890624 has 144 divisors (see below), whose sum is σ = 1107292032. Its totient is φ = 121110528.

The previous prime is 388890599. The next prime is 388890709. The reversal of 388890624 is 426098883.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9043947 + ... + 9043989.

It is an arithmetic number, because the mean of its divisors is an integer number (7689528).

Almost surely, 2^388890624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 388890624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (553646016).

388890624 is an abundant number, since it is smaller than the sum of its proper divisors (718401408).

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

388890624 is an frugal number, since it uses more digits than its factorization.

388890624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 48.

The square root of 388890624 is about 19720.3099367125. The cubic root of 388890624 is about 729.9209422110.

The spelling of 388890624 in words is "three hundred eighty-eight million, eight hundred ninety thousand, six hundred twenty-four".