18218344 has 16 divisors (see below), whose sum is σ = 34341120. Its totient is φ = 9060720.

The previous prime is 18218329. The next prime is 18218357. The reversal of 18218344 is 44381281.

It is a super-3 number, since 3×18218344³ (a number of 23 digits) contains 333 as substring.

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, 4434 + ... + 7489.

It is an arithmetic number, because the mean of its divisors is an integer number (2146320).

Almost surely, 2^18218344 is an apocalyptic number.

It is an amenable number.

18218344 is a deficient number, since it is larger than the sum of its proper divisors (16122776).

18218344 is a wasteful number, since it uses less digits than its factorization.

18218344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12120 (or 12116 counting only the distinct ones).

The product of its digits is 6144, while the sum is 31.

The square root of 18218344 is about 4268.2952100341. The cubic root of 18218344 is about 263.1295558929.

The spelling of 18218344 in words is "eighteen million, two hundred eighteen thousand, three hundred forty-four".