13968989 has 2 divisors, whose sum is σ = 13968990. Its totient is φ = 13968988.

The previous prime is 13968961. The next prime is 13968991. The reversal of 13968989 is 98986931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7425625 + 6543364 = 2725^2 + 2558^2 .

It is a cyclic number.

It is not a de Polignac number, because 13968989 - 2¹² = 13964893 is a prime.

It is a Sophie Germain prime.

Together with 13968991, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13968989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13968919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6984494 + 6984495.

It is an arithmetic number, because the mean of its divisors is an integer number (6984495).

Almost surely, 2^13968989 is an apocalyptic number.

It is an amenable number.

13968989 is a deficient number, since it is larger than the sum of its proper divisors (1).

13968989 is an equidigital number, since it uses as much as digits as its factorization.

13968989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 53.

The square root of 13968989 is about 3737.5110702177. The cubic root of 13968989 is about 240.8361402860.

The spelling of 13968989 in words is "thirteen million, nine hundred sixty-eight thousand, nine hundred eighty-nine".