18904992 has 24 divisors (see below), whose sum is σ = 49625856. Its totient is φ = 6301632.

The previous prime is 18904987. The next prime is 18904997. The reversal of 18904992 is 29940981.

It is an interprime number because it is at equal distance from previous prime (18904987) and next prime (18904997).

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (18904997) 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, 98368 + ... + 98559.

It is an arithmetic number, because the mean of its divisors is an integer number (2067744).

Almost surely, 2^18904992 is an apocalyptic number.

18904992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18904992 is an abundant number, since it is smaller than the sum of its proper divisors (30720864).

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

18904992 is a wasteful number, since it uses less digits than its factorization.

18904992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196940 (or 196932 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 18904992 is about 4347.9871204961. The cubic root of 18904992 is about 266.3946503989.

The spelling of 18904992 in words is "eighteen million, nine hundred four thousand, nine hundred ninety-two".