259999 has 4 divisors (see below), whose sum is σ = 267064. Its totient is φ = 252936.

The previous prime is 259993. The next prime is 260003. The reversal of 259999 is 999952.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 259999 - 2³ = 259991 is a prime.

It is a Duffinian number.

259999 is a modest number, since divided by 999 gives 259 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (259991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3477 + ... + 3550.

It is an arithmetic number, because the mean of its divisors is an integer number (66766).

2²⁵⁹⁹⁹⁹ is an apocalyptic number.

259999 is a deficient number, since it is larger than the sum of its proper divisors (7065).

259999 is an equidigital number, since it uses as much as digits as its factorization.

259999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7064.

The product of its digits is 65610, while the sum is 43.

The square root of 259999 is about 509.9009707777. The cubic root of 259999 is about 63.8249611615.

The spelling of 259999 in words is "two hundred fifty-nine thousand, nine hundred ninety-nine".