265305 has 16 divisors (see below), whose sum is σ = 443520. Its totient is φ = 135168.

The previous prime is 265277. The next prime is 265313. The reversal of 265305 is 503562.

It is not a de Polignac number, because 265305 - 2⁵ = 265273 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40 + ... + 729.

It is an arithmetic number, because the mean of its divisors is an integer number (27720).

2²⁶⁵³⁰⁵ is an apocalyptic number.

It is an amenable number.

265305 is a deficient number, since it is larger than the sum of its proper divisors (178215).

265305 is a wasteful number, since it uses less digits than its factorization.

265305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 265305 is about 515.0776640469. The cubic root of 265305 is about 64.2562157431.

Adding to 265305 its reverse (503562), we get a palindrome (768867).

The spelling of 265305 in words is "two hundred sixty-five thousand, three hundred five".