12661423 has 4 divisors (see below), whose sum is σ = 13069888. Its totient is φ = 12252960.

The previous prime is 12661399. The next prime is 12661433. The reversal of 12661423 is 32416621.

12661423 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32416621 = 2917 ⋅11113.

It is a cyclic number.

It is not a de Polignac number, because 12661423 - 2⁹ = 12660911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12661433) 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, 204186 + ... + 204247.

It is an arithmetic number, because the mean of its divisors is an integer number (3267472).

Almost surely, 2^12661423 is an apocalyptic number.

12661423 is a deficient number, since it is larger than the sum of its proper divisors (408465).

12661423 is an equidigital number, since it uses as much as digits as its factorization.

12661423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408464.

The product of its digits is 1728, while the sum is 25.

The square root of 12661423 is about 3558.2893361839. The cubic root of 12661423 is about 233.0741841674.

The spelling of 12661423 in words is "twelve million, six hundred sixty-one thousand, four hundred twenty-three".