13668289 has 4 divisors (see below), whose sum is σ = 14472324. Its totient is φ = 12864256.

The previous prime is 13668283. The next prime is 13668299. The reversal of 13668289 is 98286631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5602689 + 8065600 = 2367^2 + 2840^2 .

It is a cyclic number.

It is not a de Polignac number, because 13668289 - 2⁵ = 13668257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13668283) 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 in 3 ways as a sum of consecutive naturals, for example, 401992 + ... + 402025.

It is an arithmetic number, because the mean of its divisors is an integer number (3618081).

Almost surely, 2^13668289 is an apocalyptic number.

It is an amenable number.

13668289 is a deficient number, since it is larger than the sum of its proper divisors (804035).

13668289 is an equidigital number, since it uses as much as digits as its factorization.

13668289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804034.

The product of its digits is 124416, while the sum is 43.

The square root of 13668289 is about 3697.0649169307. The cubic root of 13668289 is about 239.0954900490.

The spelling of 13668289 in words is "thirteen million, six hundred sixty-eight thousand, two hundred eighty-nine".