205897 has 4 divisors (see below), whose sum is σ = 208000. Its totient is φ = 203796.

The previous prime is 205883. The next prime is 205913. The reversal of 205897 is 798502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205897 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205817) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 897 + ... + 1102.

It is an arithmetic number, because the mean of its divisors is an integer number (52000).

2²⁰⁵⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

205897 is a deficient number, since it is larger than the sum of its proper divisors (2103).

205897 is a wasteful number, since it uses less digits than its factorization.

205897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 205897 is about 453.7587464722. The cubic root of 205897 is about 59.0495609609.

The spelling of 205897 in words is "two hundred five thousand, eight hundred ninety-seven".