18539044 has 24 divisors (see below), whose sum is σ = 34496280. Its totient is φ = 8687616.

The previous prime is 18538997. The next prime is 18539051. The reversal of 18539044 is 44093581.

It can be written as a sum of positive squares in 4 ways, for example, as 6553600 + 11985444 = 2560^2 + 3462^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22512 + ... + 23320.

It is an arithmetic number, because the mean of its divisors is an integer number (1437345).

Almost surely, 2^18539044 is an apocalyptic number.

It is an amenable number.

18539044 is a deficient number, since it is larger than the sum of its proper divisors (15957236).

18539044 is a wasteful number, since it uses less digits than its factorization.

18539044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1167 (or 1165 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 18539044 is about 4305.6990140975. The cubic root of 18539044 is about 264.6645524163.

The spelling of 18539044 in words is "eighteen million, five hundred thirty-nine thousand, forty-four".