18221484 has 48 divisors (see below), whose sum is σ = 45360000. Its totient is φ = 5673216.

The previous prime is 18221479. The next prime is 18221509. The reversal of 18221484 is 48412281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36267 + ... + 36765.

It is an arithmetic number, because the mean of its divisors is an integer number (945000).

Almost surely, 2^18221484 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 18221484, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22680000).

18221484 is an abundant number, since it is smaller than the sum of its proper divisors (27138516).

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

18221484 is a wasteful number, since it uses less digits than its factorization.

18221484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702 (or 700 counting only the distinct ones).

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

The square root of 18221484 is about 4268.6630225400. The cubic root of 18221484 is about 263.1446721469.

The spelling of 18221484 in words is "eighteen million, two hundred twenty-one thousand, four hundred eighty-four".