12666406 has 16 divisors (see below), whose sum is σ = 19730880. Its totient is φ = 6096840.

The previous prime is 12666389. The next prime is 12666413. The reversal of 12666406 is 60466621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207616 + ... + 207676.

It is an arithmetic number, because the mean of its divisors is an integer number (1233180).

Almost surely, 2^12666406 is an apocalyptic number.

12666406 is a deficient number, since it is larger than the sum of its proper divisors (7064474).

12666406 is an frugal number, since it uses more digits than its factorization.

12666406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 12666406 is about 3558.9894633168. The cubic root of 12666406 is about 233.1047562006.

The spelling of 12666406 in words is "twelve million, six hundred sixty-six thousand, four hundred six".