22539 has 8 divisors (see below), whose sum is σ = 32832. Its totient is φ = 13640.

The previous prime is 22531. The next prime is 22541. The reversal of 22539 is 93522.

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

It is not a de Polignac number, because 22539 - 2³ = 22531 is a prime.

It is a d-powerful number, because it can be written as 2⁴ + 2⁸ + 5⁶ + 3⁸ + 9² .

It is a plaindrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (22531) 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, 309 + ... + 374.

It is an arithmetic number, because the mean of its divisors is an integer number (4104).

2²²⁵³⁹ is an apocalyptic number.

22539 is a deficient number, since it is larger than the sum of its proper divisors (10293).

22539 is a wasteful number, since it uses less digits than its factorization.

22539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697.

The product of its digits is 540, while the sum is 21.

The square root of 22539 is about 150.1299437154. The cubic root of 22539 is about 28.2473827424.

It can be divided in two parts, 22 and 539, that added together give a triangular number (561 = T₃₃).

The spelling of 22539 in words is "twenty-two thousand, five hundred thirty-nine".