18216844 has 6 divisors (see below), whose sum is σ = 31879484. Its totient is φ = 9108420.

The previous prime is 18216823. The next prime is 18216853. The reversal of 18216844 is 44861281.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2277102 + ... + 2277109.

Almost surely, 2^18216844 is an apocalyptic number.

It is an amenable number.

18216844 is a deficient number, since it is larger than the sum of its proper divisors (13662640).

18216844 is a wasteful number, since it uses less digits than its factorization.

18216844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4554215 (or 4554213 counting only the distinct ones).

The product of its digits is 12288, while the sum is 34.

The square root of 18216844 is about 4268.1194922354. The cubic root of 18216844 is about 263.1223341395.

The spelling of 18216844 in words is "eighteen million, two hundred sixteen thousand, eight hundred forty-four".