13985989 has 2 divisors, whose sum is σ = 13985990. Its totient is φ = 13985988.

The previous prime is 13985987. The next prime is 13986013. The reversal of 13985989 is 98958931.

13985989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13068225 + 917764 = 3615^2 + 958^2 .

It is a cyclic number.

It is not a de Polignac number, because 13985989 - 2¹ = 13985987 is a prime.

Together with 13985987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13985987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6992994 + 6992995.

It is an arithmetic number, because the mean of its divisors is an integer number (6992995).

Almost surely, 2^13985989 is an apocalyptic number.

It is an amenable number.

13985989 is a deficient number, since it is larger than the sum of its proper divisors (1).

13985989 is an equidigital number, since it uses as much as digits as its factorization.

13985989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 699840, while the sum is 52.

The square root of 13985989 is about 3739.7846194667. The cubic root of 13985989 is about 240.9337983829.

The spelling of 13985989 in words is "thirteen million, nine hundred eighty-five thousand, nine hundred eighty-nine".