18218912 has 24 divisors (see below), whose sum is σ = 36158976. Its totient is φ = 9035712.

The previous prime is 18218903. The next prime is 18218947. The reversal of 18218912 is 21981281.

It is a Harshad number since it is a multiple of its sum of digits (32).

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, 1823 + ... + 6305.

It is an arithmetic number, because the mean of its divisors is an integer number (1506624).

Almost surely, 2^18218912 is an apocalyptic number.

It is an amenable number.

18218912 is a deficient number, since it is larger than the sum of its proper divisors (17940064).

18218912 is a wasteful number, since it uses less digits than its factorization.

18218912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4620 (or 4612 counting only the distinct ones).

The product of its digits is 2304, while the sum is 32.

The square root of 18218912 is about 4268.3617466190. The cubic root of 18218912 is about 263.1322904268.

The spelling of 18218912 in words is "eighteen million, two hundred eighteen thousand, nine hundred twelve".