13968809 has 2 divisors, whose sum is σ = 13968810. Its totient is φ = 13968808.

The previous prime is 13968767. The next prime is 13968811. The reversal of 13968809 is 90886931.

13968809 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., 13542400 + 426409 = 3680^2 + 653^2 .

It is an emirp because it is prime and its reverse (90886931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13968809 - 2¹⁶ = 13903273 is a prime.

Together with 13968811, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13968809.

It is not a weakly prime, because it can be changed into another prime (13968209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6984404 + 6984405.

It is an arithmetic number, because the mean of its divisors is an integer number (6984405).

Almost surely, 2^13968809 is an apocalyptic number.

It is an amenable number.

13968809 is a deficient number, since it is larger than the sum of its proper divisors (1).

13968809 is an equidigital number, since it uses as much as digits as its factorization.

13968809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 13968809 is about 3737.4869899439. The cubic root of 13968809 is about 240.8351058353.

The spelling of 13968809 in words is "thirteen million, nine hundred sixty-eight thousand, eight hundred nine".