18923 has 4 divisors (see below), whose sum is σ = 19200. Its totient is φ = 18648.

The previous prime is 18919. The next prime is 18947. The reversal of 18923 is 32981.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18923 - 2² = 18919 is a prime.

It is an Ulam number.

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

It is a Duffinian number.

It is a plaindrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (18913) 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, 53 + ... + 201.

It is an arithmetic number, because the mean of its divisors is an integer number (4800).

2¹⁸⁹²³ is an apocalyptic number.

18923 is a deficient number, since it is larger than the sum of its proper divisors (277).

18923 is a wasteful number, since it uses less digits than its factorization.

18923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276.

The product of its digits is 432, while the sum is 23.

The square root of 18923 is about 137.5608956063. The cubic root of 18923 is about 26.6479208532.

It can be divided in two parts, 189 and 23, that added together give a palindrome (212).

The spelling of 18923 in words is "eighteen thousand, nine hundred twenty-three".