18073989 has 32 divisors (see below), whose sum is σ = 28425600. Its totient is φ = 11329920.

The previous prime is 18073981. The next prime is 18074027. The reversal of 18073989 is 98937081.

It is not a de Polignac number, because 18073989 - 2³ = 18073981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18073981) 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 31 ways as a sum of consecutive naturals, for example, 31822 + ... + 32384.

It is an arithmetic number, because the mean of its divisors is an integer number (888300).

Almost surely, 2^18073989 is an apocalyptic number.

It is an amenable number.

18073989 is a deficient number, since it is larger than the sum of its proper divisors (10351611).

18073989 is a wasteful number, since it uses less digits than its factorization.

18073989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642 (or 636 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 18073989 is about 4251.3514321919. The cubic root of 18073989 is about 262.4327337848.

The spelling of 18073989 in words is "eighteen million, seventy-three thousand, nine hundred eighty-nine".