844641225 has 18 divisors (see below), whose sum is σ = 1512846686. Its totient is φ = 450475200.

The previous prime is 844641223. The next prime is 844641251. The reversal of 844641225 is 522146448.

844641225 is a `hidden beast` number, since 8 + 4 + 4 + 641 + 2 + 2 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 622521 + 844018704 = 789^2 + 29052^2 .

It is not a de Polignac number, because 844641225 - 2¹ = 844641223 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 844641225.

It is not an unprimeable number, because it can be changed into a prime (844641223) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1876756 + ... + 1877205.

Almost surely, 2^844641225 is an apocalyptic number.

It is an amenable number.

844641225 is a deficient number, since it is larger than the sum of its proper divisors (668205461).

844641225 is a wasteful number, since it uses less digits than its factorization.

844641225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3753977 (or 3753969 counting only the distinct ones).

The product of its digits is 61440, while the sum is 36.

The square root of 844641225 is about 29062.7119347111. The cubic root of 844641225 is about 945.2733735007.

The spelling of 844641225 in words is "eight hundred forty-four million, six hundred forty-one thousand, two hundred twenty-five".