18389 has 8 divisors (see below), whose sum is σ = 21888. Its totient is φ = 15120.

The previous prime is 18379. The next prime is 18397. The reversal of 18389 is 98381.

18389 = T₆ + T₇ + ... + T₄₇.

It is a happy number.

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

It is not a de Polignac number, because 18389 - 2⁸ = 18133 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18329) 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, 224 + ... + 294.

It is an arithmetic number, because the mean of its divisors is an integer number (2736).

2¹⁸³⁸⁹ is an apocalyptic number.

It is an amenable number.

18389 is a deficient number, since it is larger than the sum of its proper divisors (3499).

18389 is an equidigital number, since it uses as much as digits as its factorization.

18389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115.

The product of its digits is 1728, while the sum is 29.

The square root of 18389 is about 135.6060470628. The cubic root of 18389 is about 26.3948604932.

Subtracting from 18389 its product of digits (1728), we obtain a palindrome (16661).

It can be divided in two parts, 183 and 89, that added together give a palindrome (272).

The spelling of 18389 in words is "eighteen thousand, three hundred eighty-nine".