18264444 has 48 divisors (see below), whose sum is σ = 46811520. Its totient is φ = 5496640.

The previous prime is 18264439. The next prime is 18264451. The reversal of 18264444 is 44446281.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

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, 23242 + ... + 24014.

It is an arithmetic number, because the mean of its divisors is an integer number (975240).

Almost surely, 2^18264444 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 18264444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23405760).

18264444 is an abundant number, since it is smaller than the sum of its proper divisors (28547076).

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

18264444 is a wasteful number, since it uses less digits than its factorization.

18264444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970 (or 968 counting only the distinct ones).

The product of its digits is 24576, while the sum is 33.

The square root of 18264444 is about 4273.6920806254. The cubic root of 18264444 is about 263.3513114184.

It can be divided in two parts, 18 and 264444, that added together give a palindrome (264462).

The spelling of 18264444 in words is "eighteen million, two hundred sixty-four thousand, four hundred forty-four".