18989188 has 6 divisors (see below), whose sum is σ = 33231086. Its totient is φ = 9494592.

The previous prime is 18989161. The next prime is 18989197. The reversal of 18989188 is 88198981.

It can be written as a sum of positive squares in only one way, i.e., 18939904 + 49284 = 4352^2 + 222^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2373645 + ... + 2373652.

Almost surely, 2^18989188 is an apocalyptic number.

It is an amenable number.

18989188 is a deficient number, since it is larger than the sum of its proper divisors (14241898).

18989188 is a wasteful number, since it uses less digits than its factorization.

18989188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4747301 (or 4747299 counting only the distinct ones).

The product of its digits is 331776, while the sum is 52.

The square root of 18989188 is about 4357.6585455953. The cubic root of 18989188 is about 266.7895399022.

The spelling of 18989188 in words is "eighteen million, nine hundred eighty-nine thousand, one hundred eighty-eight".