218903 has 4 divisors (see below), whose sum is σ = 219840. Its totient is φ = 217968.

The previous prime is 218887. The next prime is 218923. The reversal of 218903 is 309812.

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 218903 - 2⁴ = 218887 is a prime.

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

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218 + ... + 696.

It is an arithmetic number, because the mean of its divisors is an integer number (54960).

2²¹⁸⁹⁰³ is an apocalyptic number.

218903 is a deficient number, since it is larger than the sum of its proper divisors (937).

218903 is an equidigital number, since it uses as much as digits as its factorization.

218903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936.

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

The square root of 218903 is about 467.8707086365. The cubic root of 218903 is about 60.2676010169.

Subtracting 218903 from its reverse (309812), we obtain a palindrome (90909).

The spelling of 218903 in words is "two hundred eighteen thousand, nine hundred three".