23543 has 4 divisors (see below), whose sum is σ = 25368. Its totient is φ = 21720.

The previous prime is 23539. The next prime is 23549. The reversal of 23543 is 34532.

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 23543 - 2² = 23539 is a prime.

It is a d-powerful number, because it can be written as 2⁹ + 3⁴ + 5 + 4⁷ + 3⁸ .

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23549) 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, 893 + ... + 918.

It is an arithmetic number, because the mean of its divisors is an integer number (6342).

2²³⁵⁴³ is an apocalyptic number.

23543 is a deficient number, since it is larger than the sum of its proper divisors (1825).

23543 is a wasteful number, since it uses less digits than its factorization.

23543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1824.

The product of its digits is 360, while the sum is 17.

The square root of 23543 is about 153.4372836047. The cubic root of 23543 is about 28.6607312993.

The spelling of 23543 in words is "twenty-three thousand, five hundred forty-three".