12887779 has 4 divisors (see below), whose sum is σ = 12938184. Its totient is φ = 12837376.

The previous prime is 12887773. The next prime is 12887807. The reversal of 12887779 is 97778821.

12887779 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.

It is a cyclic number.

It is not a de Polignac number, because 12887779 - 2⁹ = 12887267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12887773) 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, 24817 + ... + 25330.

It is an arithmetic number, because the mean of its divisors is an integer number (3234546).

Almost surely, 2^12887779 is an apocalyptic number.

12887779 is a deficient number, since it is larger than the sum of its proper divisors (50405).

12887779 is an equidigital number, since it uses as much as digits as its factorization.

12887779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50404.

The product of its digits is 395136, while the sum is 49.

The square root of 12887779 is about 3589.9552922007. The cubic root of 12887779 is about 234.4549250140.

The spelling of 12887779 in words is "twelve million, eight hundred eighty-seven thousand, seven hundred seventy-nine".