188899988 has 24 divisors (see below), whose sum is σ = 361315584. Its totient is φ = 86025600.

The previous prime is 188899987. The next prime is 188900017. The reversal of 188899988 is 889998881.

It is a Harshad number since it is a multiple of its sum of digits (68).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188899987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42698 + ... + 46913.

It is an arithmetic number, because the mean of its divisors is an integer number (15054816).

Almost surely, 2^188899988 is an apocalyptic number.

It is an amenable number.

188899988 is a deficient number, since it is larger than the sum of its proper divisors (172415596).

188899988 is a wasteful number, since it uses less digits than its factorization.

188899988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89663 (or 89661 counting only the distinct ones).

The product of its digits is 23887872, while the sum is 68.

The square root of 188899988 is about 13744.0892022716. The cubic root of 188899988 is about 573.7781115358.

The spelling of 188899988 in words is "one hundred eighty-eight million, eight hundred ninety-nine thousand, nine hundred eighty-eight".