12666229 has 4 divisors (see below), whose sum is σ = 12699180. Its totient is φ = 12633280.

The previous prime is 12666211. The next prime is 12666239. The reversal of 12666229 is 92266621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6426225 + 6240004 = 2535^2 + 2498^2 .

It is a cyclic number.

It is not a de Polignac number, because 12666229 - 2¹¹ = 12664181 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12666194 and 12666203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12666239) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 15892 + ... + 16669.

It is an arithmetic number, because the mean of its divisors is an integer number (3174795).

Almost surely, 2^12666229 is an apocalyptic number.

It is an amenable number.

12666229 is a deficient number, since it is larger than the sum of its proper divisors (32951).

12666229 is an equidigital number, since it uses as much as digits as its factorization.

12666229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32950.

The product of its digits is 15552, while the sum is 34.

The square root of 12666229 is about 3558.9645966208. The cubic root of 12666229 is about 233.1036703958.

The spelling of 12666229 in words is "twelve million, six hundred sixty-six thousand, two hundred twenty-nine".