12666242 has 4 divisors (see below), whose sum is σ = 18999366. Its totient is φ = 6333120.

The previous prime is 12666239. The next prime is 12666263. The reversal of 12666242 is 24266621.

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

It can be written as a sum of positive squares in only one way, i.e., 9357481 + 3308761 = 3059^2 + 1819^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3166559 + ... + 3166562.

Almost surely, 2^12666242 is an apocalyptic number.

12666242 is a deficient number, since it is larger than the sum of its proper divisors (6333124).

12666242 is an equidigital number, since it uses as much as digits as its factorization.

12666242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6333123.

The product of its digits is 6912, while the sum is 29.

The square root of 12666242 is about 3558.9664229942. The cubic root of 12666242 is about 233.1037501445.

The spelling of 12666242 in words is "twelve million, six hundred sixty-six thousand, two hundred forty-two".