205539 has 8 divisors (see below), whose sum is σ = 276672. Its totient is φ = 135720.

The previous prime is 205537. The next prime is 205549. The reversal of 205539 is 935502.

205539 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 205539 - 2¹ = 205537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205537) 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, 132 + ... + 654.

It is an arithmetic number, because the mean of its divisors is an integer number (34584).

2²⁰⁵⁵³⁹ is an apocalyptic number.

205539 is a deficient number, since it is larger than the sum of its proper divisors (71133).

205539 is a wasteful number, since it uses less digits than its factorization.

205539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657.

The product of its (nonzero) digits is 1350, while the sum is 24.

The square root of 205539 is about 453.3640920938. The cubic root of 205539 is about 59.0153172909.

The spelling of 205539 in words is "two hundred five thousand, five hundred thirty-nine".