18318992 has 20 divisors (see below), whose sum is σ = 35581056. Its totient is φ = 9136800.

The previous prime is 18318991. The next prime is 18319003. The reversal of 18318992 is 29981381.

It is not an unprimeable number, because it can be changed into a prime (18318991) 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, 6617 + ... + 8967.

Almost surely, 2^18318992 is an apocalyptic number.

It is an amenable number.

18318992 is a deficient number, since it is larger than the sum of its proper divisors (17262064).

18318992 is a wasteful number, since it uses less digits than its factorization.

18318992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2846 (or 2840 counting only the distinct ones).

The product of its digits is 31104, while the sum is 41.

The square root of 18318992 is about 4280.0691583198. The cubic root of 18318992 is about 263.6132230329.

The spelling of 18318992 in words is "eighteen million, three hundred eighteen thousand, nine hundred ninety-two".