18044555 has 8 divisors (see below), whose sum is σ = 21676272. Its totient is φ = 14420448.

The previous prime is 18044549. The next prime is 18044557. The reversal of 18044555 is 55544081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18044555 - 2¹² = 18040459 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (18044557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8369 + ... + 10301.

It is an arithmetic number, because the mean of its divisors is an integer number (2709534).

Almost surely, 2^18044555 is an apocalyptic number.

18044555 is a deficient number, since it is larger than the sum of its proper divisors (3631717).

18044555 is a wasteful number, since it uses less digits than its factorization.

18044555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3805.

The product of its (nonzero) digits is 16000, while the sum is 32.

The square root of 18044555 is about 4247.8882989081. Note that the first 3 decimals coincide. The cubic root of 18044555 is about 262.2901966827.

The spelling of 18044555 in words is "eighteen million, forty-four thousand, five hundred fifty-five".