42244225 has 12 divisors (see below), whose sum is σ = 52786800. Its totient is φ = 33534800.

The previous prime is 42244217. The next prime is 42244229. The reversal of 42244225 is 52244224.

It is not a de Polignac number, because 42244225 - 2³ = 42244217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 42244225.

It is not an unprimeable number, because it can be changed into a prime (42244229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3175 + ... + 9724.

It is an arithmetic number, because the mean of its divisors is an integer number (4398900).

Almost surely, 2^42244225 is an apocalyptic number.

It is an amenable number.

42244225 is a deficient number, since it is larger than the sum of its proper divisors (10542575).

42244225 is a wasteful number, since it uses less digits than its factorization.

42244225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13040 (or 13035 counting only the distinct ones).

The product of its digits is 5120, while the sum is 25.

The square root of 42244225 is about 6499.5557540497. Note that the first 3 decimals coincide. The cubic root of 42244225 is about 348.2751187917.

Adding to 42244225 its reverse (52244224), we get a palindrome (94488449).

Subtracting 42244225 from its reverse (52244224), we obtain a palindrome (9999999).

The spelling of 42244225 in words is "forty-two million, two hundred forty-four thousand, two hundred twenty-five".