225709212 has 24 divisors (see below), whose sum is σ = 549553536. Its totient is φ = 71965168.

The previous prime is 225709123. The next prime is 225709217. The reversal of 225709212 is 212907522.

It is a self number, because there is not a number n which added to its sum of digits gives 225709212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225709217) 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 in 7 ways as a sum of consecutive naturals, for example, 408618 + ... + 409169.

It is an arithmetic number, because the mean of its divisors is an integer number (22898064).

Almost surely, 2^225709212 is an apocalyptic number.

It is an amenable number.

225709212 is an abundant number, since it is smaller than the sum of its proper divisors (323844324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

225709212 is a wasteful number, since it uses less digits than its factorization.

225709212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817817 (or 817815 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 225709212 is about 15023.6218003516. The cubic root of 225709212 is about 608.8585767959.

The spelling of 225709212 in words is "two hundred twenty-five million, seven hundred nine thousand, two hundred twelve".