18383 has 4 divisors (see below), whose sum is σ = 19008. Its totient is φ = 17760.

The previous prime is 18379. The next prime is 18397. The reversal of 18383 is 38381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38381 = 7 ⋅5483.

It is a cyclic number.

It is not a de Polignac number, because 18383 - 2² = 18379 is a prime.

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

It is a Duffinian 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 (18313) 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, 266 + ... + 327.

It is an arithmetic number, because the mean of its divisors is an integer number (4752).

2¹⁸³⁸³ is an apocalyptic number.

18383 is a deficient number, since it is larger than the sum of its proper divisors (625).

18383 is an equidigital number, since it uses as much as digits as its factorization.

18383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624.

The product of its digits is 576, while the sum is 23.

The square root of 18383 is about 135.5839223507. The cubic root of 18383 is about 26.3919894582.

The spelling of 18383 in words is "eighteen thousand, three hundred eighty-three".