12748709 has 4 divisors (see below), whose sum is σ = 12762240. Its totient is φ = 12735180.

The previous prime is 12748699. The next prime is 12748711. The reversal of 12748709 is 90784721.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12748709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12741709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5237 + ... + 7274.

It is an arithmetic number, because the mean of its divisors is an integer number (3190560).

Almost surely, 2^12748709 is an apocalyptic number.

It is an amenable number.

12748709 is a deficient number, since it is larger than the sum of its proper divisors (13531).

12748709 is a wasteful number, since it uses less digits than its factorization.

12748709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13530.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 12748709 is about 3570.5334335362. The cubic root of 12748709 is about 233.6085512152.

The spelling of 12748709 in words is "twelve million, seven hundred forty-eight thousand, seven hundred nine".