188920988 has 18 divisors (see below), whose sum is σ = 345227064. Its totient is φ = 90290464.

The previous prime is 188920969. The next prime is 188920997. The reversal of 188920988 is 889029881.

It is a super-2 number, since 2×188920988² = 71382279413792288, which contains 22 as substring.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 131120 + ... + 132552.

Almost surely, 2^188920988 is an apocalyptic number.

It is an amenable number.

188920988 is a deficient number, since it is larger than the sum of its proper divisors (156306076).

188920988 is an equidigital number, since it uses as much as digits as its factorization.

188920988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2893 (or 1458 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 53.

The square root of 188920988 is about 13744.8531458143. The cubic root of 188920988 is about 573.7993730404.

The spelling of 188920988 in words is "one hundred eighty-eight million, nine hundred twenty thousand, nine hundred eighty-eight".