245817 has 24 divisors (see below), whose sum is σ = 419328. Its totient is φ = 136800.

The previous prime is 245789. The next prime is 245821. The reversal of 245817 is 718542.

It is not a de Polignac number, because 245817 - 2⁶ = 245753 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245897) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1192 + ... + 1382.

It is an arithmetic number, because the mean of its divisors is an integer number (17472).

2²⁴⁵⁸¹⁷ is an apocalyptic number.

It is an amenable number.

245817 is a deficient number, since it is larger than the sum of its proper divisors (173511).

245817 is a wasteful number, since it uses less digits than its factorization.

245817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 218 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 245817 is about 495.7993545780. The cubic root of 245817 is about 62.6427244941.

The spelling of 245817 in words is "two hundred forty-five thousand, eight hundred seventeen".