388217872 has 20 divisors (see below), whose sum is σ = 859625536. Its totient is φ = 166379040.

The previous prime is 388217857. The next prime is 388217873. The reversal of 388217872 is 278712883.

It is a super-2 number, since 2×388217872² = 301426232280416768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (388217873) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1733004 + ... + 1733227.

Almost surely, 2^388217872 is an apocalyptic number.

It is an amenable number.

388217872 is an abundant number, since it is smaller than the sum of its proper divisors (471407664).

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

388217872 is a wasteful number, since it uses less digits than its factorization.

388217872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3466246 (or 3466240 counting only the distinct ones).

The product of its digits is 301056, while the sum is 46.

The square root of 388217872 is about 19703.2452149386. The cubic root of 388217872 is about 729.4997961961.

The spelling of 388217872 in words is "three hundred eighty-eight million, two hundred seventeen thousand, eight hundred seventy-two".