12009218 has 16 divisors (see below), whose sum is σ = 19493880. Its totient is φ = 5515776.

The previous prime is 12009209. The next prime is 12009223. The reversal of 12009218 is 81290021.

It can be written as a sum of positive squares in 4 ways, for example, as 11785489 + 223729 = 3433^2 + 473^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12009193 and 12009202.

It is an unprimeable number.

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, 4946 + ... + 6962.

Almost surely, 2^12009218 is an apocalyptic number.

12009218 is a deficient number, since it is larger than the sum of its proper divisors (7484662).

12009218 is a wasteful number, since it uses less digits than its factorization.

12009218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2261.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 12009218 is about 3465.4318634190. The cubic root of 12009218 is about 229.0014555948.

Adding to 12009218 its reverse (81290021), we get a palindrome (93299239).

The spelling of 12009218 in words is "twelve million, nine thousand, two hundred eighteen".