388775928 has 16 divisors (see below), whose sum is σ = 971939880. Its totient is φ = 129591968.

The previous prime is 388775917. The next prime is 388775953. The reversal of 388775928 is 829577883.

It is a happy number.

It is a super-2 number, since 2×388775928² = 302293444384522368, which contains 22 as substring.

It is a congruent number.

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, 8099475 + ... + 8099522.

Almost surely, 2^388775928 is an apocalyptic number.

It is an amenable number.

388775928 is an abundant number, since it is smaller than the sum of its proper divisors (583163952).

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

388775928 is a wasteful number, since it uses less digits than its factorization.

388775928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16199006 (or 16199002 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 57.

The square root of 388775928 is about 19717.4016543763. The cubic root of 388775928 is about 729.8491763219.

The spelling of 388775928 in words is "three hundred eighty-eight million, seven hundred seventy-five thousand, nine hundred twenty-eight".