12780879 has 4 divisors (see below), whose sum is σ = 17041176. Its totient is φ = 8520584.

The previous prime is 12780877. The next prime is 12780881. The reversal of 12780879 is 97808721.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (12780877) and next prime (12780881).

It is a cyclic number.

It is not a de Polignac number, because 12780879 - 2¹ = 12780877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12780879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12780871) 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, 2130144 + ... + 2130149.

It is an arithmetic number, because the mean of its divisors is an integer number (4260294).

Almost surely, 2^12780879 is an apocalyptic number.

12780879 is a deficient number, since it is larger than the sum of its proper divisors (4260297).

12780879 is an equidigital number, since it uses as much as digits as its factorization.

12780879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4260296.

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 12780879 is about 3575.0355242990. The cubic root of 12780879 is about 233.8048815438.

The spelling of 12780879 in words is "twelve million, seven hundred eighty thousand, eight hundred seventy-nine".