13856779 has 2 divisors, whose sum is σ = 13856780. Its totient is φ = 13856778.

The previous prime is 13856753. The next prime is 13856789. The reversal of 13856779 is 97765831.

It is a strong prime.

It is an emirp because it is prime and its reverse (97765831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13856779 - 2⁵ = 13856747 is a prime.

It is not a weakly prime, because it can be changed into another prime (13856789) 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, 6928389 + 6928390.

It is an arithmetic number, because the mean of its divisors is an integer number (6928390).

Almost surely, 2^13856779 is an apocalyptic number.

13856779 is a deficient number, since it is larger than the sum of its proper divisors (1).

13856779 is an equidigital number, since it uses as much as digits as its factorization.

13856779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 46.

The square root of 13856779 is about 3722.4694760333. The cubic root of 13856779 is about 240.1895435528.

The spelling of 13856779 in words is "thirteen million, eight hundred fifty-six thousand, seven hundred seventy-nine".