12717729 has 20 divisors (see below), whose sum is σ = 19118484. Its totient is φ = 8424864.

The previous prime is 12717709. The next prime is 12717763. The reversal of 12717729 is 92771721.

It can be written as a sum of positive squares in 2 ways, for example, as 10093329 + 2624400 = 3177^2 + 1620^2 .

It is not a de Polignac number, because 12717729 - 2⁵ = 12717697 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12717693 and 12717702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12717709) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15559 + ... + 16355.

Almost surely, 2^12717729 is an apocalyptic number.

It is an amenable number.

12717729 is a deficient number, since it is larger than the sum of its proper divisors (6400755).

12717729 is an equidigital number, since it uses as much as digits as its factorization.

12717729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006 (or 997 counting only the distinct ones).

The product of its digits is 12348, while the sum is 36.

The square root of 12717729 is about 3566.1925074230. The cubic root of 12717729 is about 233.4191709129.

The spelling of 12717729 in words is "twelve million, seven hundred seventeen thousand, seven hundred twenty-nine".