18303 has 4 divisors (see below), whose sum is σ = 24408. Its totient is φ = 12200.

The previous prime is 18301. The next prime is 18307. The reversal of 18303 is 30381.

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

It is a cyclic number.

It is not a de Polignac number, because 18303 - 2¹ = 18301 is a prime.

It is an Ulam number.

It is a D-number.

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

18303 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18301) 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, 3048 + ... + 3053.

It is an arithmetic number, because the mean of its divisors is an integer number (6102).

2¹⁸³⁰³ is an apocalyptic number.

18303 is a deficient number, since it is larger than the sum of its proper divisors (6105).

18303 is an equidigital number, since it uses as much as digits as its factorization.

18303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6104.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 18303 is about 135.2885804493. The cubic root of 18303 is about 26.3536491555.

Adding to 18303 its reverse (30381), we get a palindrome (48684).

The spelling of 18303 in words is "eighteen thousand, three hundred three".