18044015 has 32 divisors (see below), whose sum is σ = 25712640. Its totient is φ = 12009600.

The previous prime is 18043999. The next prime is 18044017. The reversal of 18044015 is 51044081.

It is not a de Polignac number, because 18044015 - 2⁴ = 18043999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18044017) 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 31 ways as a sum of consecutive naturals, for example, 32117 + ... + 32673.

It is an arithmetic number, because the mean of its divisors is an integer number (803520).

Almost surely, 2^18044015 is an apocalyptic number.

18044015 is a deficient number, since it is larger than the sum of its proper divisors (7668625).

18044015 is a wasteful number, since it uses less digits than its factorization.

18044015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 18044015 is about 4247.8247374392. The cubic root of 18044015 is about 262.2875802310.

Adding to 18044015 its reverse (51044081), we get a palindrome (69088096).

The spelling of 18044015 in words is "eighteen million, forty-four thousand, fifteen".