18003744 has 72 divisors (see below), whose sum is σ = 55862352. Its totient is φ = 5454720.

The previous prime is 18003743. The next prime is 18003749. The reversal of 18003744 is 44730081.

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (18003743) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 327 + ... + 6009.

It is an arithmetic number, because the mean of its divisors is an integer number (775866).

Almost surely, 2^18003744 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 18003744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27931176).

18003744 is an abundant number, since it is smaller than the sum of its proper divisors (37858608).

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

18003744 is a wasteful number, since it uses less digits than its factorization.

18003744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5710 (or 5699 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 18003744 is about 4243.0818988089. The cubic root of 18003744 is about 262.0923086349.

It can be divided in two parts, 180037 and 44, that added together give a palindrome (180081).

The spelling of 18003744 in words is "eighteen million, three thousand, seven hundred forty-four".