42543 has 12 divisors (see below), whose sum is σ = 63960. Its totient is φ = 27216.

The previous prime is 42533. The next prime is 42557. The reversal of 42543 is 34524.

It is a happy number.

It is not a de Polignac number, because 42543 - 2¹⁰ = 41519 is a prime.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 180 + ... + 342.

It is an arithmetic number, because the mean of its divisors is an integer number (5330).

2⁴²⁵⁴³ is an apocalyptic number.

42543 is a deficient number, since it is larger than the sum of its proper divisors (21417).

42543 is a wasteful number, since it uses less digits than its factorization.

42543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 195 counting only the distinct ones).

The product of its digits is 480, while the sum is 18.

The square root of 42543 is about 206.2595452337. The cubic root of 42543 is about 34.9094256745.

It can be divided in two parts, 42 and 543, that added together give a palindrome (585).

The spelling of 42543 in words is "forty-two thousand, five hundred forty-three".