18008544 has 48 divisors (see below), whose sum is σ = 47733840. Its totient is φ = 5944320.

The previous prime is 18008539. The next prime is 18008579. The reversal of 18008544 is 44580081.

It is a tau number, because it is divible by the number of its divisors (48).

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, 9604 + ... + 11324.

It is an arithmetic number, because the mean of its divisors is an integer number (994455).

Almost surely, 2^18008544 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 18008544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23866920).

18008544 is an abundant number, since it is smaller than the sum of its proper divisors (29725296).

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

18008544 is a wasteful number, since it uses less digits than its factorization.

18008544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1843 (or 1835 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 18008544 is about 4243.6474877162. The cubic root of 18008544 is about 262.1155988145.

The spelling of 18008544 in words is "eighteen million, eight thousand, five hundred forty-four".