204859 has 2 divisors, whose sum is σ = 204860. Its totient is φ = 204858.

The previous prime is 204857. The next prime is 204871. The reversal of 204859 is 958402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 204859 - 2¹ = 204857 is a prime.

Together with 204857, it forms a pair of twin primes.

204859 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (204857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102429 + 102430.

It is an arithmetic number, because the mean of its divisors is an integer number (102430).

2²⁰⁴⁸⁵⁹ is an apocalyptic number.

204859 is a deficient number, since it is larger than the sum of its proper divisors (1).

204859 is an equidigital number, since it uses as much as digits as its factorization.

204859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 204859 is about 452.6135216716. The cubic root of 204859 is about 58.9501637957.

The spelling of 204859 in words is "two hundred four thousand, eight hundred fifty-nine".