13718989 has 2 divisors, whose sum is σ = 13718990. Its totient is φ = 13718988.

The previous prime is 13718981. The next prime is 13719029. The reversal of 13718989 is 98981731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13286025 + 432964 = 3645^2 + 658^2 .

It is a cyclic number.

It is not a de Polignac number, because 13718989 - 2³ = 13718981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13718981) 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, 6859494 + 6859495.

It is an arithmetic number, because the mean of its divisors is an integer number (6859495).

Almost surely, 2^13718989 is an apocalyptic number.

It is an amenable number.

13718989 is a deficient number, since it is larger than the sum of its proper divisors (1).

13718989 is an equidigital number, since it uses as much as digits as its factorization.

13718989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 46.

The square root of 13718989 is about 3703.9153608040. The cubic root of 13718989 is about 239.3907521669.

The spelling of 13718989 in words is "thirteen million, seven hundred eighteen thousand, nine hundred eighty-nine".