12506779 has 4 divisors (see below), whose sum is σ = 13050576. Its totient is φ = 11962984.

The previous prime is 12506771. The next prime is 12506783. The reversal of 12506779 is 97760521.

12506779 is digitally balanced in base 3, 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 an emirpimes, since its reverse is a distinct semiprime: 97760521 = 3607 ⋅27103.

It is a cyclic number.

It is not a de Polignac number, because 12506779 - 2³ = 12506771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12506771) 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, 271864 + ... + 271909.

It is an arithmetic number, because the mean of its divisors is an integer number (3262644).

Almost surely, 2^12506779 is an apocalyptic number.

12506779 is a deficient number, since it is larger than the sum of its proper divisors (543797).

12506779 is an equidigital number, since it uses as much as digits as its factorization.

12506779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543796.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 12506779 is about 3536.4924713620. The cubic root of 12506779 is about 232.1213878731.

The spelling of 12506779 in words is "twelve million, five hundred six thousand, seven hundred seventy-nine".