18218244 has 36 divisors (see below), whose sum is σ = 46728752. Its totient is φ = 5520240.

The previous prime is 18218209. The next prime is 18218257. The reversal of 18218244 is 44281281.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4822 + ... + 7725.

Almost surely, 2^18218244 is an apocalyptic number.

It is an amenable number.

18218244 is an abundant number, since it is smaller than the sum of its proper divisors (28510508).

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

18218244 is a wasteful number, since it uses less digits than its factorization.

18218244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12576 (or 12563 counting only the distinct ones).

The product of its digits is 4096, while the sum is 30.

The square root of 18218244 is about 4268.2834957392. The cubic root of 18218244 is about 263.1290744550.

The spelling of 18218244 in words is "eighteen million, two hundred eighteen thousand, two hundred forty-four".