205939 has 4 divisors (see below), whose sum is σ = 208080. Its totient is φ = 203800.

The previous prime is 205937. The next prime is 205949. The reversal of 205939 is 939502.

205939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 205939 - 2¹ = 205937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205937) 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, 919 + ... + 1120.

It is an arithmetic number, because the mean of its divisors is an integer number (52020).

2²⁰⁵⁹³⁹ is an apocalyptic number.

205939 is a deficient number, since it is larger than the sum of its proper divisors (2141).

205939 is a wasteful number, since it uses less digits than its factorization.

205939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2140.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 205939 is about 453.8050242119. The cubic root of 205939 is about 59.0535757725.

It can be divided in two parts, 20593 and 9, that added together give a palindrome (20602).

The spelling of 205939 in words is "two hundred five thousand, nine hundred thirty-nine".