18903 has 4 divisors (see below), whose sum is σ = 25208. Its totient is φ = 12600.

The previous prime is 18899. The next prime is 18911. The reversal of 18903 is 30981.

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

It is not a de Polignac number, because 18903 - 2² = 18899 is a prime.

It is a D-number.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18903.

It is a congruent number.

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, 3148 + ... + 3153.

It is an arithmetic number, because the mean of its divisors is an integer number (6302).

2¹⁸⁹⁰³ is an apocalyptic number.

18903 is a deficient number, since it is larger than the sum of its proper divisors (6305).

18903 is an equidigital number, since it uses as much as digits as its factorization.

18903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6304.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 18903 is about 137.4881813102. The cubic root of 18903 is about 26.6385293491.

The spelling of 18903 in words is "eighteen thousand, nine hundred three".