188199972 has 18 divisors (see below), whose sum is σ = 475727798. Its totient is φ = 62733312.

The previous prime is 188199943. The next prime is 188199989. The reversal of 188199972 is 279991881.

188199972 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 106007616 + 82192356 = 10296^2 + 9066^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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, 2613853 + ... + 2613924.

Almost surely, 2^188199972 is an apocalyptic number.

188199972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

188199972 is an abundant number, since it is smaller than the sum of its proper divisors (287527826).

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

188199972 is a wasteful number, since it uses less digits than its factorization.

188199972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5227787 (or 5227782 counting only the distinct ones).

The product of its digits is 653184, while the sum is 54.

The square root of 188199972 is about 13718.5994912017. The cubic root of 188199972 is about 573.0684749541.

The spelling of 188199972 in words is "one hundred eighty-eight million, one hundred ninety-nine thousand, nine hundred seventy-two".