205399 has 2 divisors, whose sum is σ = 205400. Its totient is φ = 205398.

The previous prime is 205397. The next prime is 205417. The reversal of 205399 is 993502.

205399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205399 - 2¹ = 205397 is a prime.

Together with 205397, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102699 + 102700.

It is an arithmetic number, because the mean of its divisors is an integer number (102700).

205399 is a Friedman number, since it can be written as 59^(9/3)+20, using all its digits and the basic arithmetic operations.

2²⁰⁵³⁹⁹ is an apocalyptic number.

205399 is a deficient number, since it is larger than the sum of its proper divisors (1).

205399 is an equidigital number, since it uses as much as digits as its factorization.

205399 is an odious number, because the sum of its binary digits is odd.

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

The square root of 205399 is about 453.2096645042. The cubic root of 205399 is about 59.0019150963.

The spelling of 205399 in words is "two hundred five thousand, three hundred ninety-nine".