27543 has 4 divisors (see below), whose sum is σ = 36728. Its totient is φ = 18360.

The previous prime is 27541. The next prime is 27551. The reversal of 27543 is 34572.

It is a happy number.

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

It is not a de Polignac number, because 27543 - 2¹ = 27541 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27541) 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, 4588 + ... + 4593.

It is an arithmetic number, because the mean of its divisors is an integer number (9182).

2²⁷⁵⁴³ is an apocalyptic number.

27543 is a deficient number, since it is larger than the sum of its proper divisors (9185).

27543 is an equidigital number, since it uses as much as digits as its factorization.

27543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9184.

The product of its digits is 840, while the sum is 21.

The square root of 27543 is about 165.9608387542. The cubic root of 27543 is about 30.1997777859.

The spelling of 27543 in words is "twenty-seven thousand, five hundred forty-three".