245745 has 24 divisors (see below), whose sum is σ = 439296. Its totient is φ = 127008.

The previous prime is 245741. The next prime is 245747. The reversal of 245745 is 547542.

It is not a de Polignac number, because 245745 - 2² = 245741 is a prime.

It is not an unprimeable number, because it can be changed into a prime (245741) 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, 1872 + ... + 1998.

It is an arithmetic number, because the mean of its divisors is an integer number (18304).

2²⁴⁵⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

245745 is a deficient number, since it is larger than the sum of its proper divisors (193551).

245745 is a wasteful number, since it uses less digits than its factorization.

245745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 178 counting only the distinct ones).

The product of its digits is 5600, while the sum is 27.

The square root of 245745 is about 495.7267392425. The cubic root of 245745 is about 62.6366078618.

It can be divided in two parts, 245 and 745, that added together give a triangular number (990 = T₄₄).

The spelling of 245745 in words is "two hundred forty-five thousand, seven hundred forty-five".