18543 has 8 divisors (see below), whose sum is σ = 28288. Its totient is φ = 10584.

The previous prime is 18541. The next prime is 18553. The reversal of 18543 is 34581.

18543 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18543 - 2¹ = 18541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 883 = 18543 / (1 + 8 + 5 + 4 + 3).

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

It is a Duffinian number.

18543 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 421 + ... + 462.

It is an arithmetic number, because the mean of its divisors is an integer number (3536).

2¹⁸⁵⁴³ is an apocalyptic number.

18543 is a deficient number, since it is larger than the sum of its proper divisors (9745).

18543 is an equidigital number, since it uses as much as digits as its factorization.

18543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893.

The product of its digits is 480, while the sum is 21.

The square root of 18543 is about 136.1726844855. The cubic root of 18543 is about 26.4683376445.

Multiplying 18543 by its sum of digits (21), we get a triangular number (389403 = T₈₈₂).

It can be divided in two parts, 18 and 543, that added together give a triangular number (561 = T₃₃).

The spelling of 18543 in words is "eighteen thousand, five hundred forty-three".