12665218 has 8 divisors (see below), whose sum is σ = 19063548. Its totient is φ = 6310704.

The previous prime is 12665207. The next prime is 12665243. The reversal of 12665218 is 81256621.

It can be written as a sum of positive squares in 2 ways, for example, as 7969329 + 4695889 = 2823^2 + 2167^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 12665218.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10221 + ... + 11392.

Almost surely, 2^12665218 is an apocalyptic number.

12665218 is a deficient number, since it is larger than the sum of its proper divisors (6398330).

12665218 is a wasteful number, since it uses less digits than its factorization.

12665218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21908.

The product of its digits is 5760, while the sum is 31.

The square root of 12665218 is about 3558.8225580942. The cubic root of 12665218 is about 233.0974682320.

The spelling of 12665218 in words is "twelve million, six hundred sixty-five thousand, two hundred eighteen".