18013044 has 48 divisors (see below), whose sum is σ = 49161728. Its totient is φ = 5025888.

The previous prime is 18013003. The next prime is 18013049. The reversal of 18013044 is 44031081.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 18013044.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18013049) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1119 + ... + 6105.

Almost surely, 2^18013044 is an apocalyptic number.

18013044 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18013044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24580864).

18013044 is an abundant number, since it is smaller than the sum of its proper divisors (31148684).

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

18013044 is a wasteful number, since it uses less digits than its factorization.

18013044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5044 (or 5042 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 18013044 is about 4244.1776588640. The cubic root of 18013044 is about 262.1374295996.

The spelling of 18013044 in words is "eighteen million, thirteen thousand, forty-four".