12729 has 4 divisors (see below), whose sum is σ = 16976. Its totient is φ = 8484.

The previous prime is 12721. The next prime is 12739. The reversal of 12729 is 92721.

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.

It is not a de Polignac number, because 12729 - 2³ = 12721 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

12729 is a lucky number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (12721) 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, 2119 + ... + 2124.

It is an arithmetic number, because the mean of its divisors is an integer number (4244).

2¹²⁷²⁹ is an apocalyptic number.

It is an amenable number.

12729 is a deficient number, since it is larger than the sum of its proper divisors (4247).

12729 is an equidigital number, since it uses as much as digits as its factorization.

12729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4246.

The product of its digits is 252, while the sum is 21.

The square root of 12729 is about 112.8228700220. The cubic root of 12729 is about 23.3488105932.

It can be divided in two parts, 12 and 729, that added together give a triangular number (741 = T₃₈).

The spelling of 12729 in words is "twelve thousand, seven hundred twenty-nine".