18697 has 4 divisors (see below), whose sum is σ = 21376. Its totient is φ = 16020.

The previous prime is 18691. The next prime is 18701. The reversal of 18697 is 79681.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79681 = 7 ⋅11383.

It is a cyclic number.

It is not a de Polignac number, because 18697 - 2¹¹ = 16649 is a prime.

It is a d-powerful number, because it can be written as 1 + 8³ + 6⁴ + 9² + 7⁵ .

It is a Duffinian number.

It is a nialpdrome in base 8.

It is a zygodrome in base 3 and base 8.

It is not an unprimeable number, because it can be changed into a prime (18691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1329 + ... + 1342.

It is an arithmetic number, because the mean of its divisors is an integer number (5344).

2¹⁸⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

18697 is a deficient number, since it is larger than the sum of its proper divisors (2679).

18697 is an equidigital number, since it uses as much as digits as its factorization.

18697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2678.

The product of its digits is 3024, while the sum is 31.

The square root of 18697 is about 136.7369737854. The cubic root of 18697 is about 26.5414090942.

The spelling of 18697 in words is "eighteen thousand, six hundred ninety-seven".