18000544 has 12 divisors (see below), whose sum is σ = 35438634. Its totient is φ = 9000256.

The previous prime is 18000539. The next prime is 18000547. The reversal of 18000544 is 44500081.

It can be written as a sum of positive squares in only one way, i.e., 16096144 + 1904400 = 4012^2 + 1380^2 .

It is not an unprimeable number, because it can be changed into a prime (18000547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 281227 + ... + 281290.

Almost surely, 2^18000544 is an apocalyptic number.

It is an amenable number.

18000544 is a deficient number, since it is larger than the sum of its proper divisors (17438090).

18000544 is an equidigital number, since it uses as much as digits as its factorization.

18000544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562527 (or 562519 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 18000544 is about 4242.7047976497. The cubic root of 18000544 is about 262.0767795486.

The spelling of 18000544 in words is "eighteen million, five hundred forty-four", and thus it is an aban number.