12978859 has 2 divisors, whose sum is σ = 12978860. Its totient is φ = 12978858.

The previous prime is 12978857. The next prime is 12978883. The reversal of 12978859 is 95887921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12978859 - 2¹ = 12978857 is a prime.

Together with 12978857, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12978851) 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 as a sum of consecutive naturals, namely, 6489429 + 6489430.

It is an arithmetic number, because the mean of its divisors is an integer number (6489430).

Almost surely, 2^12978859 is an apocalyptic number.

12978859 is a deficient number, since it is larger than the sum of its proper divisors (1).

12978859 is an equidigital number, since it uses as much as digits as its factorization.

12978859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 49.

The square root of 12978859 is about 3602.6183533647. The cubic root of 12978859 is about 235.0059391890.

The spelling of 12978859 in words is "twelve million, nine hundred seventy-eight thousand, eight hundred fifty-nine".