388640872 has 24 divisors (see below), whose sum is σ = 734879250. Its totient is φ = 192678240.

The previous prime is 388640851. The next prime is 388640921. The reversal of 388640872 is 278046883.

It can be written as a sum of positive squares in only one way, i.e., 376903396 + 11737476 = 19414^2 + 3426^2 .

It is a Smith number, since the sum of its digits (46) 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 5 ways as a sum of consecutive naturals, for example, 680347 + ... + 680917.

Almost surely, 2^388640872 is an apocalyptic number.

It is an amenable number.

388640872 is a deficient number, since it is larger than the sum of its proper divisors (346238378).

388640872 is an equidigital number, since it uses as much as digits as its factorization.

388640872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1297 (or 722 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 46.

The square root of 388640872 is about 19713.9765648638. The cubic root of 388640872 is about 729.7646529761.

The spelling of 388640872 in words is "three hundred eighty-eight million, six hundred forty thousand, eight hundred seventy-two".