13989917 has 2 divisors, whose sum is σ = 13989918. Its totient is φ = 13989916.

The previous prime is 13989907. The next prime is 13989931. The reversal of 13989917 is 71998931.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11464996 + 2524921 = 3386^2 + 1589^2 .

It is a cyclic number.

It is not a de Polignac number, because 13989917 - 2⁶ = 13989853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13989907) 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, 6994958 + 6994959.

It is an arithmetic number, because the mean of its divisors is an integer number (6994959).

Almost surely, 2^13989917 is an apocalyptic number.

It is an amenable number.

13989917 is a deficient number, since it is larger than the sum of its proper divisors (1).

13989917 is an equidigital number, since it uses as much as digits as its factorization.

13989917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 47.

The square root of 13989917 is about 3740.3097465317. The cubic root of 13989917 is about 240.9563518916.

The spelling of 13989917 in words is "thirteen million, nine hundred eighty-nine thousand, nine hundred seventeen".