259909 has 4 divisors (see below), whose sum is σ = 279916. Its totient is φ = 239904.

The previous prime is 259907. The next prime is 259933. The reversal of 259909 is 909952.

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

It can be written as a sum of positive squares in 2 ways, for example, as 91809 + 168100 = 303^2 + 410^2 .

It is a cyclic number.

It is not a de Polignac number, because 259909 - 2¹ = 259907 is a prime.

259909 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (259907) 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, 9984 + ... + 10009.

It is an arithmetic number, because the mean of its divisors is an integer number (69979).

2²⁵⁹⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

259909 is a deficient number, since it is larger than the sum of its proper divisors (20007).

259909 is a wasteful number, since it uses less digits than its factorization.

259909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20006.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 259909 is about 509.8127107086. The cubic root of 259909 is about 63.8175958647.

The spelling of 259909 in words is "two hundred fifty-nine thousand, nine hundred nine".