264865 has 4 divisors (see below), whose sum is σ = 317844. Its totient is φ = 211888.

The previous prime is 264839. The next prime is 264871. The reversal of 264865 is 568462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 568462 = 2 ⋅284231.

It can be written as a sum of positive squares in 2 ways, for example, as 173056 + 91809 = 416^2 + 303^2 .

It is a cyclic number.

It is not a de Polignac number, because 264865 - 2⁹ = 264353 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a zygodrome in base 3.

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, 26482 + ... + 26491.

It is an arithmetic number, because the mean of its divisors is an integer number (79461).

2²⁶⁴⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

264865 is a deficient number, since it is larger than the sum of its proper divisors (52979).

264865 is an equidigital number, since it uses as much as digits as its factorization.

264865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52978.

The product of its digits is 11520, while the sum is 31.

The square root of 264865 is about 514.6503667540. The cubic root of 264865 is about 64.2206737830.

The spelling of 264865 in words is "two hundred sixty-four thousand, eight hundred sixty-five".