12127729 has 4 divisors (see below), whose sum is σ = 12144880. Its totient is φ = 12110580.

The previous prime is 12127721. The next prime is 12127733. The reversal of 12127729 is 92772121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92772121 = 13 ⋅7136317.

It is a cyclic number.

It is not a de Polignac number, because 12127729 - 2³ = 12127721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12127729.

It is not an unprimeable number, because it can be changed into a prime (12127721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7467 + ... + 8944.

It is an arithmetic number, because the mean of its divisors is an integer number (3036220).

Almost surely, 2^12127729 is an apocalyptic number.

It is an amenable number.

12127729 is a deficient number, since it is larger than the sum of its proper divisors (17151).

12127729 is an equidigital number, since it uses as much as digits as its factorization.

12127729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17150.

The product of its digits is 3528, while the sum is 31.

The square root of 12127729 is about 3482.4889088122. The cubic root of 12127729 is about 229.7522789720.

The spelling of 12127729 in words is "twelve million, one hundred twenty-seven thousand, seven hundred twenty-nine".