40539 has 4 divisors (see below), whose sum is σ = 54056. Its totient is φ = 27024.

The previous prime is 40531. The next prime is 40543. The reversal of 40539 is 93504.

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

It is not a de Polignac number, because 40539 - 2³ = 40531 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40531) 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, 6754 + ... + 6759.

It is an arithmetic number, because the mean of its divisors is an integer number (13514).

2⁴⁰⁵³⁹ is an apocalyptic number.

40539 is a deficient number, since it is larger than the sum of its proper divisors (13517).

40539 is a wasteful number, since it uses less digits than its factorization.

40539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13516.

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

The square root of 40539 is about 201.3429909383. The cubic root of 40539 is about 34.3524469144.

It can be divided in two parts, 405 and 39, that added together give a palindrome (444).

The spelling of 40539 in words is "forty thousand, five hundred thirty-nine".