245765 has 16 divisors (see below), whose sum is σ = 336000. Its totient is φ = 171072.

The previous prime is 245759. The next prime is 245771. The reversal of 245765 is 567542.

245765 = T₁₉ + T₂₀ + ... + T₁₁₃.

It is an interprime number because it is at equal distance from previous prime (245759) and next prime (245771).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245765 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a zygodrome in base 4.

It is a congruent number.

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, 1136 + ... + 1334.

It is an arithmetic number, because the mean of its divisors is an integer number (21000).

245765 is a Friedman number, since it can be written as 5+(6*5*4^7)/2, using all its digits and the basic arithmetic operations.

2²⁴⁵⁷⁶⁵ is an apocalyptic number.

It is an amenable number.

245765 is a deficient number, since it is larger than the sum of its proper divisors (90235).

245765 is a wasteful number, since it uses less digits than its factorization.

245765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236.

The product of its digits is 8400, while the sum is 29.

The square root of 245765 is about 495.7469112360. The cubic root of 245765 is about 62.6383070461.

The spelling of 245765 in words is "two hundred forty-five thousand, seven hundred sixty-five".