388780 has 24 divisors (see below), whose sum is σ = 933408. Its totient is φ = 133248.

The previous prime is 388777. The next prime is 388781. The reversal of 388780 is 87883.

It is a super-2 number, since 2×388780² = 302299776800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (388781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1249 + ... + 1528.

It is an arithmetic number, because the mean of its divisors is an integer number (38892).

2³⁸⁸⁷⁸⁰ is an apocalyptic number.

It is an amenable number.

388780 is an abundant number, since it is smaller than the sum of its proper divisors (544628).

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

388780 is a wasteful number, since it uses less digits than its factorization.

388780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2793 (or 2791 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 388780 is about 623.5222530111. The cubic root of 388780 is about 72.9851724435.

The spelling of 388780 in words is "three hundred eighty-eight thousand, seven hundred eighty".