18497 has 4 divisors (see below), whose sum is σ = 18900. Its totient is φ = 18096.

The previous prime is 18493. The next prime is 18503. The reversal of 18497 is 79481.

18497 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 136²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13456 + 5041 = 116^2 + 71^2 .

It is a cyclic number.

It is not a de Polignac number, because 18497 - 2² = 18493 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18493) 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, 122 + ... + 227.

It is an arithmetic number, because the mean of its divisors is an integer number (4725).

2¹⁸⁴⁹⁷ is an apocalyptic number.

It is an amenable number.

18497 is a deficient number, since it is larger than the sum of its proper divisors (403).

18497 is an equidigital number, since it uses as much as digits as its factorization.

18497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402.

The product of its digits is 2016, while the sum is 29.

The square root of 18497 is about 136.0036764209. The cubic root of 18497 is about 26.4464326720.

It can be divided in two parts, 18 and 497, that added together give a palindrome (515).

The spelling of 18497 in words is "eighteen thousand, four hundred ninety-seven".