18218464 has 48 divisors (see below), whose sum is σ = 39720240. Its totient is φ = 8156160.

The previous prime is 18218449. The next prime is 18218477. The reversal of 18218464 is 46481281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25342 + ... + 26050.

It is an arithmetic number, because the mean of its divisors is an integer number (827505).

Almost surely, 2^18218464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18218464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19860120).

18218464 is an abundant number, since it is smaller than the sum of its proper divisors (21501776).

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

18218464 is a wasteful number, since it uses less digits than its factorization.

18218464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803 (or 795 counting only the distinct ones).

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

The square root of 18218464 is about 4268.3092671455. The cubic root of 18218464 is about 263.1301336161.

The spelling of 18218464 in words is "eighteen million, two hundred eighteen thousand, four hundred sixty-four".