225845 has 8 divisors (see below), whose sum is σ = 287064. Its totient is φ = 169984.

The previous prime is 225839. The next prime is 225859. The reversal of 225845 is 548522.

It can be written as a sum of positive squares in 4 ways, for example, as 61009 + 164836 = 247^2 + 406^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 225845 - 2⁴ = 225829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1244 + ... + 1413.

It is an arithmetic number, because the mean of its divisors is an integer number (35883).

2²²⁵⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

225845 is a deficient number, since it is larger than the sum of its proper divisors (61219).

225845 is a wasteful number, since it uses less digits than its factorization.

225845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679.

The product of its digits is 3200, while the sum is 26.

The square root of 225845 is about 475.2315225235. The cubic root of 225845 is about 60.8980649962.

The spelling of 225845 in words is "two hundred twenty-five thousand, eight hundred forty-five".