12779709 has 4 divisors (see below), whose sum is σ = 17039616. Its totient is φ = 8519804.

The previous prime is 12779707. The next prime is 12779713. The reversal of 12779709 is 90797721.

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 not a de Polignac number, because 12779709 - 2¹ = 12779707 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12779707) 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, 2129949 + ... + 2129954.

It is an arithmetic number, because the mean of its divisors is an integer number (4259904).

Almost surely, 2^12779709 is an apocalyptic number.

It is an amenable number.

12779709 is a deficient number, since it is larger than the sum of its proper divisors (4259907).

12779709 is an equidigital number, since it uses as much as digits as its factorization.

12779709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4259906.

The product of its (nonzero) digits is 55566, while the sum is 42.

The square root of 12779709 is about 3574.8718858163. The cubic root of 12779709 is about 233.7977469260.

The spelling of 12779709 in words is "twelve million, seven hundred seventy-nine thousand, seven hundred nine".