13968209 has 2 divisors, whose sum is σ = 13968210. Its totient is φ = 13968208.

The previous prime is 13968187. The next prime is 13968217. The reversal of 13968209 is 90286931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13897984 + 70225 = 3728^2 + 265^2 .

It is a cyclic number.

It is not a de Polignac number, because 13968209 - 2¹² = 13964113 is a prime.

It is a super-2 number, since 2×13968209² = 390221725335362, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13968239) 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, 6984104 + 6984105.

It is an arithmetic number, because the mean of its divisors is an integer number (6984105).

Almost surely, 2^13968209 is an apocalyptic number.

It is an amenable number.

13968209 is a deficient number, since it is larger than the sum of its proper divisors (1).

13968209 is an equidigital number, since it uses as much as digits as its factorization.

13968209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 13968209 is about 3737.4067212440. The cubic root of 13968209 is about 240.8316576021.

The spelling of 13968209 in words is "thirteen million, nine hundred sixty-eight thousand, two hundred nine".