259845 has 16 divisors (see below), whose sum is σ = 440640. Its totient is φ = 130304.

The previous prime is 259841. The next prime is 259867. The reversal of 259845 is 548952.

It is a cyclic number.

It is not a de Polignac number, because 259845 - 2² = 259841 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (259841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255 + ... + 764.

It is an arithmetic number, because the mean of its divisors is an integer number (27540).

259845 is a Friedman number, since it can be written as 5+(4^5-9)*2^8, using all its digits and the basic arithmetic operations.

2²⁵⁹⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

259845 is a deficient number, since it is larger than the sum of its proper divisors (180795).

259845 is a wasteful number, since it uses less digits than its factorization.

259845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044.

The product of its digits is 14400, while the sum is 33.

The square root of 259845 is about 509.7499386954. The cubic root of 259845 is about 63.8123572858.

It can be divided in two parts, 25 and 9845, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 259845 in words is "two hundred fifty-nine thousand, eight hundred forty-five".