18115044 has 12 divisors (see below), whose sum is σ = 42268464. Its totient is φ = 6038344.

The previous prime is 18115043. The next prime is 18115061. The reversal of 18115044 is 44051181.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (18115043) 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 3 ways as a sum of consecutive naturals, for example, 754782 + ... + 754805.

It is an arithmetic number, because the mean of its divisors is an integer number (3522372).

Almost surely, 2^18115044 is an apocalyptic number.

It is an amenable number.

18115044 is an abundant number, since it is smaller than the sum of its proper divisors (24153420).

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

18115044 is a wasteful number, since it uses less digits than its factorization.

18115044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1509594 (or 1509592 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 18115044 is about 4256.1771579670. The cubic root of 18115044 is about 262.6312885205.

It can be divided in two parts, 181 and 15044, that added together give a triangular number (15225 = T₁₇₄).

The spelling of 18115044 in words is "eighteen million, one hundred fifteen thousand, forty-four".