12439729 has 3 divisors (see below), whose sum is σ = 12443257. Its totient is φ = 12436202.

The previous prime is 12439727. The next prime is 12439751. The reversal of 12439729 is 92793421.

The square root of 12439729 is 3527.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 12439729 - 2¹ = 12439727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12439723) 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 2 ways as a sum of consecutive naturals, for example, 1764 + ... + 5290.

Almost surely, 2^12439729 is an apocalyptic number.

12439729 is the 3527-th square number.

12439729 is the 1764-th centered octagonal number.

It is an amenable number.

12439729 is a deficient number, since it is larger than the sum of its proper divisors (3528).

12439729 is an frugal number, since it uses more digits than its factorization.

12439729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7054 (or 3527 counting only the distinct ones).

The product of its digits is 27216, while the sum is 37.

The cubic root of 12439729 is about 231.7058362997.

The spelling of 12439729 in words is "twelve million, four hundred thirty-nine thousand, seven hundred twenty-nine".