12225218 has 16 divisors (see below), whose sum is σ = 18698040. Its totient is φ = 5993856.

The previous prime is 12225209. The next prime is 12225221. The reversal of 12225218 is 81252221.

It can be written as a sum of positive squares in 4 ways, for example, as 11580409 + 644809 = 3403^2 + 803^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12225193 and 12225202.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 30596 + ... + 30992.

Almost surely, 2^12225218 is an apocalyptic number.

12225218 is a deficient number, since it is larger than the sum of its proper divisors (6472822).

12225218 is a wasteful number, since it uses less digits than its factorization.

12225218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661.

The product of its digits is 640, while the sum is 23.

The square root of 12225218 is about 3496.4579219547. The cubic root of 12225218 is about 230.3662595469.

Adding to 12225218 its reverse (81252221), we get a palindrome (93477439).

The spelling of 12225218 in words is "twelve million, two hundred twenty-five thousand, two hundred eighteen".