260905 has 4 divisors (see below), whose sum is σ = 313092. Its totient is φ = 208720.

The previous prime is 260893. The next prime is 260921. The reversal of 260905 is 509062.

260905 = 157² + 158² + ... + 166².

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 55696 + 205209 = 236^2 + 453^2 .

It is not a de Polignac number, because 260905 - 2⁵ = 260873 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26086 + ... + 26095.

It is an arithmetic number, because the mean of its divisors is an integer number (78273).

2²⁶⁰⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

260905 is a deficient number, since it is larger than the sum of its proper divisors (52187).

260905 is an equidigital number, since it uses as much as digits as its factorization.

260905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52186.

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

The square root of 260905 is about 510.7886059810. The cubic root of 260905 is about 63.8990106487.

Adding to 260905 its reverse (509062), we get a palindrome (769967).

The spelling of 260905 in words is "two hundred sixty thousand, nine hundred five".