225643844 has 6 divisors (see below), whose sum is σ = 394876734. Its totient is φ = 112821920.

The previous prime is 225643841. The next prime is 225643849. The reversal of 225643844 is 448346522.

It is a happy number.

225643844 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 222367744 + 3276100 = 14912^2 + 1810^2 .

It is a junction number, because it is equal to n+sod(n) for n = 225643798 and 225643807.

It is not an unprimeable number, because it can be changed into a prime (225643841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28205477 + ... + 28205484.

It is an arithmetic number, because the mean of its divisors is an integer number (65812789).

Almost surely, 2^225643844 is an apocalyptic number.

It is an amenable number.

225643844 is a deficient number, since it is larger than the sum of its proper divisors (169232890).

225643844 is a wasteful number, since it uses less digits than its factorization.

225643844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56410965 (or 56410963 counting only the distinct ones).

The product of its digits is 184320, while the sum is 38.

The square root of 225643844 is about 15021.4461354425. The cubic root of 225643844 is about 608.7997936239.

The spelling of 225643844 in words is "two hundred twenty-five million, six hundred forty-three thousand, eight hundred forty-four".