205839 has 6 divisors (see below), whose sum is σ = 297336. Its totient is φ = 137220.

The previous prime is 205837. The next prime is 205847. The reversal of 205839 is 938502.

It is not a de Polignac number, because 205839 - 2¹ = 205837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205837) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11427 + ... + 11444.

It is an arithmetic number, because the mean of its divisors is an integer number (49556).

2²⁰⁵⁸³⁹ is an apocalyptic number.

205839 is a deficient number, since it is larger than the sum of its proper divisors (91497).

205839 is a wasteful number, since it uses less digits than its factorization.

205839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22877 (or 22874 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 205839 is about 453.6948313569. The cubic root of 205839 is about 59.0440157997.

The spelling of 205839 in words is "two hundred five thousand, eight hundred thirty-nine".