12666239 has 2 divisors, whose sum is σ = 12666240. Its totient is φ = 12666238.

The previous prime is 12666211. The next prime is 12666263. The reversal of 12666239 is 93266621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12666239 - 2²⁰ = 11617663 is a prime.

It is a super-2 number, since 2×12666239² = 320867220810242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12666199 and 12666208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12666299) 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 as a sum of consecutive naturals, namely, 6333119 + 6333120.

It is an arithmetic number, because the mean of its divisors is an integer number (6333120).

Almost surely, 2^12666239 is an apocalyptic number.

12666239 is a deficient number, since it is larger than the sum of its proper divisors (1).

12666239 is an equidigital number, since it uses as much as digits as its factorization.

12666239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 35.

The square root of 12666239 is about 3558.9660015235. The cubic root of 12666239 is about 233.1037317409.

The spelling of 12666239 in words is "twelve million, six hundred sixty-six thousand, two hundred thirty-nine".