18218544 has 40 divisors (see below), whose sum is σ = 47235072. Its totient is φ = 6050880.

The previous prime is 18218527. The next prime is 18218561. The reversal of 18218544 is 44581281.

It is an interprime number because it is at equal distance from previous prime (18218527) and next prime (18218561).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17889 + ... + 18879.

Almost surely, 2^18218544 is an apocalyptic number.

It is an amenable number.

18218544 is an abundant number, since it is smaller than the sum of its proper divisors (29016528).

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

18218544 is a wasteful number, since it uses less digits than its factorization.

18218544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385 (or 1379 counting only the distinct ones).

The product of its digits is 10240, while the sum is 33.

The square root of 18218544 is about 4268.3186385274. The cubic root of 18218544 is about 263.1305187634.

The spelling of 18218544 in words is "eighteen million, two hundred eighteen thousand, five hundred forty-four".