6442225 has 6 divisors (see below), whose sum is σ = 7988390. Its totient is φ = 5153760.

The previous prime is 6442223. The next prime is 6442237. The reversal of 6442225 is 5222446.

It can be written as a sum of positive squares in 3 ways, for example, as 952576 + 5489649 = 976^2 + 2343^2 .

It is not a de Polignac number, because 6442225 - 2¹ = 6442223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 257689 = 6442225 / (6 + 4 + 4 + 2 + 2 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 6442225.

It is not an unprimeable number, because it can be changed into a prime (6442223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 128820 + ... + 128869.

Almost surely, 2^6442225 is an apocalyptic number.

It is an amenable number.

6442225 is a deficient number, since it is larger than the sum of its proper divisors (1546165).

6442225 is a wasteful number, since it uses less digits than its factorization.

6442225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257699 (or 257694 counting only the distinct ones).

The product of its digits is 3840, while the sum is 25.

The square root of 6442225 is about 2538.1538566446. The cubic root of 6442225 is about 186.0709734157.

The spelling of 6442225 in words is "six million, four hundred forty-two thousand, two hundred twenty-five".