12729923 has 4 divisors (see below), whose sum is σ = 13478760. Its totient is φ = 11981088.

The previous prime is 12729919. The next prime is 12729947. The reversal of 12729923 is 32992721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32992721 = 19 ⋅1736459.

It is a cyclic number.

It is not a de Polignac number, because 12729923 - 2² = 12729919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12729973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 374393 + ... + 374426.

It is an arithmetic number, because the mean of its divisors is an integer number (3369690).

Almost surely, 2^12729923 is an apocalyptic number.

12729923 is a deficient number, since it is larger than the sum of its proper divisors (748837).

12729923 is an equidigital number, since it uses as much as digits as its factorization.

12729923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748836.

The product of its digits is 13608, while the sum is 35.

The square root of 12729923 is about 3567.9017643427. The cubic root of 12729923 is about 233.4937493264.

The spelling of 12729923 in words is "twelve million, seven hundred twenty-nine thousand, nine hundred twenty-three".