18489 has 4 divisors (see below), whose sum is σ = 24656.
Its totient is φ = 12324.
The previous prime is 18481. The next prime is 18493. The reversal of 18489 is 98481.
It is a happy number.
18489 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is not a de Polignac number, because 18489 - 23 = 18481 is a prime.
It is a D-number.
It is a Duffinian number.
It is a Curzon number.
It is a nialpdrome in base 13.
It is not an unprimeable number, because it can be changed into a prime (18481) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3079 + ... + 3084.
It is an arithmetic number, because the mean of its divisors is an integer number (6164).
218489 is an apocalyptic number.
It is an amenable number.
18489 is a deficient number, since it is larger than the sum of its proper divisors (6167).
18489 is an equidigital number, since it uses as much as digits as its factorization.
18489 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 6166.
The product of its digits is 2304, while the sum is 30.
The square root of 18489 is about 135.9742622705.
The cubic root of 18489 is about 26.4426194055.
The spelling of 18489 in words is "eighteen thousand, four hundred eighty-nine".