12666403 has 4 divisors (see below), whose sum is σ = 12713760. Its totient is φ = 12619048.

The previous prime is 12666389. The next prime is 12666413. The reversal of 12666403 is 30466621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30466621 = 4111 ⋅7411.

It is a cyclic number.

It is not a de Polignac number, because 12666403 - 2⁵ = 12666371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12666413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23275 + ... + 23812.

It is an arithmetic number, because the mean of its divisors is an integer number (3178440).

Almost surely, 2^12666403 is an apocalyptic number.

12666403 is a deficient number, since it is larger than the sum of its proper divisors (47357).

12666403 is an equidigital number, since it uses as much as digits as its factorization.

12666403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47356.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 12666403 is about 3558.9890418488. The cubic root of 12666403 is about 233.1047377972.

The spelling of 12666403 in words is "twelve million, six hundred sixty-six thousand, four hundred three".