18663492 has 12 divisors (see below), whose sum is σ = 43548176. Its totient is φ = 6221160.

The previous prime is 18663481. The next prime is 18663509. The reversal of 18663492 is 29436681.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 18663492.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 777634 + ... + 777657.

Almost surely, 2^18663492 is an apocalyptic number.

18663492 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18663492 is an abundant number, since it is smaller than the sum of its proper divisors (24884684).

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

18663492 is a wasteful number, since it uses less digits than its factorization.

18663492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555298 (or 1555296 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 18663492 is about 4320.1263870401. The cubic root of 18663492 is about 265.2554413640.

The spelling of 18663492 in words is "eighteen million, six hundred sixty-three thousand, four hundred ninety-two".