18216992 has 24 divisors (see below), whose sum is σ = 36219456. Its totient is φ = 9018432.

The previous prime is 18216973. The next prime is 18217019. The reversal of 18216992 is 29961281.

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, 533 + ... + 6059.

It is an arithmetic number, because the mean of its divisors is an integer number (1509144).

Almost surely, 2^18216992 is an apocalyptic number.

It is an amenable number.

18216992 is a deficient number, since it is larger than the sum of its proper divisors (18002464).

18216992 is a wasteful number, since it uses less digits than its factorization.

18216992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5640 (or 5632 counting only the distinct ones).

The product of its digits is 15552, while the sum is 38.

The square root of 18216992 is about 4268.1368300466. The cubic root of 18216992 is about 263.1230467034.

The spelling of 18216992 in words is "eighteen million, two hundred sixteen thousand, nine hundred ninety-two".