18990488 has 16 divisors (see below), whose sum is σ = 38844360. Its totient is φ = 8632000.

The previous prime is 18990487. The next prime is 18990493. The reversal of 18990488 is 88409981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18990487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107813 + ... + 107988.

Almost surely, 2^18990488 is an apocalyptic number.

It is an amenable number.

18990488 is an abundant number, since it is smaller than the sum of its proper divisors (19853872).

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

18990488 is a wasteful number, since it uses less digits than its factorization.

18990488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215818 (or 215814 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 47.

The square root of 18990488 is about 4357.8077057163. The cubic root of 18990488 is about 266.7956279015.

The spelling of 18990488 in words is "eighteen million, nine hundred ninety thousand, four hundred eighty-eight".