205868 has 24 divisors (see below), whose sum is σ = 402192. Its totient is φ = 91584.

The previous prime is 205847. The next prime is 205879. The reversal of 205868 is 868502.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 205868.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 205868.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1871 + ... + 1977.

It is an arithmetic number, because the mean of its divisors is an integer number (16758).

2²⁰⁵⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

205868 is a deficient number, since it is larger than the sum of its proper divisors (196324).

205868 is a wasteful number, since it uses less digits than its factorization.

205868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 159 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 205868 is about 453.7267900400. The cubic root of 205868 is about 59.0467885105.

The spelling of 205868 in words is "two hundred five thousand, eight hundred sixty-eight".