18005144 has 16 divisors (see below), whose sum is σ = 33839520. Its totient is φ = 8981280.

The previous prime is 18005129. The next prime is 18005147. The reversal of 18005144 is 44150081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18005147) 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, 1274 + ... + 6134.

It is an arithmetic number, because the mean of its divisors is an integer number (2114970).

Almost surely, 2^18005144 is an apocalyptic number.

It is an amenable number.

18005144 is a deficient number, since it is larger than the sum of its proper divisors (15834376).

18005144 is a wasteful number, since it uses less digits than its factorization.

18005144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5330 (or 5326 counting only the distinct ones).

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

The square root of 18005144 is about 4243.2468700277. The cubic root of 18005144 is about 262.0991020315.

The spelling of 18005144 in words is "eighteen million, five thousand, one hundred forty-four".