245865 has 16 divisors (see below), whose sum is σ = 404928. Its totient is φ = 127296.

The previous prime is 245863. The next prime is 245881. The reversal of 245865 is 568542.

It is not a de Polignac number, because 245865 - 2¹ = 245863 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 245865.

It is not an unprimeable number, because it can be changed into a prime (245863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 334 + ... + 776.

It is an arithmetic number, because the mean of its divisors is an integer number (25308).

2²⁴⁵⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

245865 is a deficient number, since it is larger than the sum of its proper divisors (159063).

245865 is a wasteful number, since it uses less digits than its factorization.

245865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488.

The product of its digits is 9600, while the sum is 30.

The square root of 245865 is about 495.8477588938. The cubic root of 245865 is about 62.6468015854.

The spelling of 245865 in words is "two hundred forty-five thousand, eight hundred sixty-five".