265905 has 24 divisors (see below), whose sum is σ = 486720. Its totient is φ = 133920.

The previous prime is 265891. The next prime is 265921. The reversal of 265905 is 509562.

265905 is a `hidden beast` number, since 2 + 659 + 0 + 5 = 666.

It is not a de Polignac number, because 265905 - 2⁵ = 265873 is a prime.

265905 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 700 + ... + 1010.

It is an arithmetic number, because the mean of its divisors is an integer number (20280).

2²⁶⁵⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

265905 is a deficient number, since it is larger than the sum of its proper divisors (220815).

265905 is a wasteful number, since it uses less digits than its factorization.

265905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 338 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 265905 is about 515.6597715548. The cubic root of 265905 is about 64.3046187788.

The spelling of 265905 in words is "two hundred sixty-five thousand, nine hundred five".