245844 has 18 divisors (see below), whose sum is σ = 621530. Its totient is φ = 81936.

The previous prime is 245821. The next prime is 245849. The reversal of 245844 is 448542.

It can be written as a sum of positive squares in only one way, i.e., 213444 + 32400 = 462^2 + 180^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3379 + ... + 3450.

2²⁴⁵⁸⁴⁴ is an apocalyptic number.

It is an amenable number.

245844 is an abundant number, since it is smaller than the sum of its proper divisors (375686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

245844 is a wasteful number, since it uses less digits than its factorization.

245844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6839 (or 6834 counting only the distinct ones).

The product of its digits is 5120, while the sum is 27.

The square root of 245844 is about 495.8265825871. The cubic root of 245844 is about 62.6450179233.

It can be divided in two parts, 245 and 844, that added together give a square (1089 = 33²).

The spelling of 245844 in words is "two hundred forty-five thousand, eight hundred forty-four".