260509 has 4 divisors (see below), whose sum is σ = 274240. Its totient is φ = 246780.

The previous prime is 260489. The next prime is 260527. The reversal of 260509 is 905062.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 905062 = 2 ⋅452531.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-260509 is a prime.

It is a Duffinian number.

260509 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 260509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (260539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6837 + ... + 6874.

It is an arithmetic number, because the mean of its divisors is an integer number (68560).

2²⁶⁰⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

260509 is a deficient number, since it is larger than the sum of its proper divisors (13731).

260509 is a wasteful number, since it uses less digits than its factorization.

260509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13730.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 260509 is about 510.4008228833. The cubic root of 260509 is about 63.8666657708.

The spelling of 260509 in words is "two hundred sixty thousand, five hundred nine".