188139190 has 16 divisors (see below), whose sum is σ = 346526928. Its totient is φ = 73505376.

The previous prime is 188139181. The next prime is 188139209. The reversal of 188139190 is 91931881.

It is a happy number.

It is a super-2 number, since 2×188139190² = 70792709627712200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218337 + ... + 219196.

It is an arithmetic number, because the mean of its divisors is an integer number (21657933).

Almost surely, 2^188139190 is an apocalyptic number.

188139190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

188139190 is a deficient number, since it is larger than the sum of its proper divisors (158387738).

188139190 is a wasteful number, since it uses less digits than its factorization.

188139190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437583.

The product of its (nonzero) digits is 15552, while the sum is 40.

The square root of 188139190 is about 13716.3839987075. The cubic root of 188139190 is about 573.0067746286.

The spelling of 188139190 in words is "one hundred eighty-eight million, one hundred thirty-nine thousand, one hundred ninety".