18004389 has 16 divisors (see below), whose sum is σ = 26745600. Its totient is φ = 10696896.

The previous prime is 18004379. The next prime is 18004417. The reversal of 18004389 is 98340081.

It is not a de Polignac number, because 18004389 - 2⁴ = 18004373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18004319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6829 + ... + 9090.

It is an arithmetic number, because the mean of its divisors is an integer number (1671600).

Almost surely, 2^18004389 is an apocalyptic number.

It is an amenable number.

18004389 is a deficient number, since it is larger than the sum of its proper divisors (8741211).

18004389 is a wasteful number, since it uses less digits than its factorization.

18004389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15964.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 18004389 is about 4243.1579042030. The cubic root of 18004389 is about 262.0954384935.

The spelling of 18004389 in words is "eighteen million, four thousand, three hundred eighty-nine".