12739709 has 4 divisors (see below), whose sum is σ = 13410240. Its totient is φ = 12069180.

The previous prime is 12739703. The next prime is 12739711. The reversal of 12739709 is 90793721.

12739709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 90793721 = 41 ⋅2214481.

It is not a de Polignac number, because 12739709 - 2²⁰ = 11691133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12739703) 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, 335237 + ... + 335274.

It is an arithmetic number, because the mean of its divisors is an integer number (3352560).

Almost surely, 2^12739709 is an apocalyptic number.

12739709 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12739709 is a deficient number, since it is larger than the sum of its proper divisors (670531).

12739709 is an equidigital number, since it uses as much as digits as its factorization.

12739709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670530.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 12739709 is about 3569.2728951427. The cubic root of 12739709 is about 233.5535659900.

The spelling of 12739709 in words is "twelve million, seven hundred thirty-nine thousand, seven hundred nine".