188139168 has 72 divisors (see below), whose sum is σ = 611458848. Its totient is φ = 53753472.

The previous prime is 188139101. The next prime is 188139181. The reversal of 188139168 is 861931881.

It is a tau number, because it is divible by the number of its divisors (72).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 44646 + ... + 48677.

It is an arithmetic number, because the mean of its divisors is an integer number (8492484).

Almost surely, 2^188139168 is an apocalyptic number.

188139168 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

188139168 is an abundant number, since it is smaller than the sum of its proper divisors (423319680).

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

188139168 is a wasteful number, since it uses less digits than its factorization.

188139168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93346 (or 93335 counting only the distinct ones).

The product of its digits is 82944, while the sum is 45.

The square root of 188139168 is about 13716.3831967469. The cubic root of 188139168 is about 573.0067522938.

The spelling of 188139168 in words is "one hundred eighty-eight million, one hundred thirty-nine thousand, one hundred sixty-eight".