245845 has 4 divisors (see below), whose sum is σ = 295020. Its totient is φ = 196672.

The previous prime is 245821. The next prime is 245849. The reversal of 245845 is 548542.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 548542 = 2 ⋅274271.

It can be written as a sum of positive squares in 2 ways, for example, as 128881 + 116964 = 359^2 + 342^2 .

It is a cyclic number.

It is not a de Polignac number, because 245845 - 2¹⁷ = 114773 is a prime.

It is a nialpdrome in base 12.

It is a zygodrome in base 4.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24580 + ... + 24589.

It is an arithmetic number, because the mean of its divisors is an integer number (73755).

2²⁴⁵⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

245845 is a deficient number, since it is larger than the sum of its proper divisors (49175).

245845 is an equidigital number, since it uses as much as digits as its factorization.

245845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49174.

The product of its digits is 6400, while the sum is 28.

The square root of 245845 is about 495.8275910032. The cubic root of 245845 is about 62.6451028618.

It can be divided in two parts, 245 and 845, that multiplied together give a square (207025 = 455²).

The spelling of 245845 in words is "two hundred forty-five thousand, eight hundred forty-five".