13856009 has 2 divisors, whose sum is σ = 13856010. Its totient is φ = 13856008.

The previous prime is 13855981. The next prime is 13856027. The reversal of 13856009 is 90065831.

13856009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9168784 + 4687225 = 3028^2 + 2165^2 .

It is an emirp because it is prime and its reverse (90065831) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13856009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13856509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6928004 + 6928005.

It is an arithmetic number, because the mean of its divisors is an integer number (6928005).

Almost surely, 2^13856009 is an apocalyptic number.

It is an amenable number.

13856009 is a deficient number, since it is larger than the sum of its proper divisors (1).

13856009 is an equidigital number, since it uses as much as digits as its factorization.

13856009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 13856009 is about 3722.3660486309. The cubic root of 13856009 is about 240.1850944820.

The spelling of 13856009 in words is "thirteen million, eight hundred fifty-six thousand, nine".