259985 has 16 divisors (see below), whose sum is σ = 354240. Its totient is φ = 181440.

The previous prime is 259967. The next prime is 259991. The reversal of 259985 is 589952.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-259985 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1514 + ... + 1676.

It is an arithmetic number, because the mean of its divisors is an integer number (22140).

2²⁵⁹⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

259985 is a deficient number, since it is larger than the sum of its proper divisors (94255).

259985 is a wasteful number, since it uses less digits than its factorization.

259985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208.

The product of its digits is 32400, while the sum is 38.

The square root of 259985 is about 509.8872424370. The cubic root of 259985 is about 63.8238155603.

The spelling of 259985 in words is "two hundred fifty-nine thousand, nine hundred eighty-five".