18004536 has 96 divisors (see below), whose sum is σ = 53913600. Its totient is φ = 5382720.

The previous prime is 18004529. The next prime is 18004537. The reversal of 18004536 is 63540081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18004537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100495 + ... + 100673.

It is an arithmetic number, because the mean of its divisors is an integer number (561600).

Almost surely, 2^18004536 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 18004536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26956800).

18004536 is an abundant number, since it is smaller than the sum of its proper divisors (35909064).

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

18004536 is a wasteful number, since it uses less digits than its factorization.

18004536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 18004536 is about 4243.1752261720. The cubic root of 18004536 is about 262.0961517997.

It can be divided in two parts, 180045 and 36, that added together give a palindrome (180081).

The spelling of 18004536 in words is "eighteen million, four thousand, five hundred thirty-six".