18009344 has 36 divisors (see below), whose sum is σ = 36350496. Its totient is φ = 8904192.

The previous prime is 18009323. The next prime is 18009401. The reversal of 18009344 is 44390081.

It is a congruent number.

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, 26027 + ... + 26709.

It is an arithmetic number, because the mean of its divisors is an integer number (1009736).

Almost surely, 2^18009344 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 18009344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18175248).

18009344 is an abundant number, since it is smaller than the sum of its proper divisors (18341152).

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

18009344 is an equidigital number, since it uses as much as digits as its factorization.

18009344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802 (or 788 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 18009344 is about 4243.7417452055. The cubic root of 18009344 is about 262.1194801087.

The spelling of 18009344 in words is "eighteen million, nine thousand, three hundred forty-four".