245805 has 16 divisors (see below), whose sum is σ = 449664. Its totient is φ = 112320.

The previous prime is 245789. The next prime is 245821. The reversal of 245805 is 508542.

It is an interprime number because it is at equal distance from previous prime (245789) and next prime (245821).

It is not a de Polignac number, because 245805 - 2⁴ = 245789 is a prime.

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 245805.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1066 + ... + 1275.

It is an arithmetic number, because the mean of its divisors is an integer number (28104).

2²⁴⁵⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

245805 is a deficient number, since it is larger than the sum of its proper divisors (203859).

245805 is a wasteful number, since it uses less digits than its factorization.

245805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 245805 is about 495.7872527607. The cubic root of 245805 is about 62.6417051383.

The spelling of 245805 in words is "two hundred forty-five thousand, eight hundred five".