18985188 has 24 divisors (see below), whose sum is σ = 45330208. Its totient is φ = 6181056.

The previous prime is 18985177. The next prime is 18985207. The reversal of 18985188 is 88158981.

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, 17881 + ... + 18912.

Almost surely, 2^18985188 is an apocalyptic number.

It is an amenable number.

18985188 is an abundant number, since it is smaller than the sum of its proper divisors (26345020).

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

18985188 is a wasteful number, since it uses less digits than its factorization.

18985188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36843 (or 36841 counting only the distinct ones).

The product of its digits is 184320, while the sum is 48.

The square root of 18985188 is about 4357.1995593500. The cubic root of 18985188 is about 266.7708058538.

The spelling of 18985188 in words is "eighteen million, nine hundred eighty-five thousand, one hundred eighty-eight".