18389289 has 16 divisors (see below), whose sum is σ = 25067520. Its totient is φ = 11988240.

The previous prime is 18389263. The next prime is 18389299. The reversal of 18389289 is 98298381.

It is a happy number.

It is not a de Polignac number, because 18389289 - 2¹⁷ = 18258217 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18389299) 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, 38152 + ... + 38630.

It is an arithmetic number, because the mean of its divisors is an integer number (1566720).

Almost surely, 2^18389289 is an apocalyptic number.

It is an amenable number.

18389289 is a deficient number, since it is larger than the sum of its proper divisors (6678231).

18389289 is a wasteful number, since it uses less digits than its factorization.

18389289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740.

The product of its digits is 248832, while the sum is 48.

The square root of 18389289 is about 4288.2734287823. The cubic root of 18389289 is about 263.9499876566.

The spelling of 18389289 in words is "eighteen million, three hundred eighty-nine thousand, two hundred eighty-nine".