18044236 has 24 divisors (see below), whose sum is σ = 37658880. Its totient is φ = 7396752.

The previous prime is 18044233. The next prime is 18044237. The reversal of 18044236 is 63244081.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (18044233) 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 7 ways as a sum of consecutive naturals, for example, 13366 + ... + 14653.

It is an arithmetic number, because the mean of its divisors is an integer number (1569120).

Almost surely, 2^18044236 is an apocalyptic number.

It is an amenable number.

18044236 is an abundant number, since it is smaller than the sum of its proper divisors (19614644).

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

18044236 is a wasteful number, since it uses less digits than its factorization.

18044236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28053 (or 28051 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 18044236 is about 4247.8507506738. The cubic root of 18044236 is about 262.2886510444.

The spelling of 18044236 in words is "eighteen million, forty-four thousand, two hundred thirty-six".