11985889 has 2 divisors, whose sum is σ = 11985890. Its totient is φ = 11985888.

The previous prime is 11985887. The next prime is 11985907. The reversal of 11985889 is 98858911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7290000 + 4695889 = 2700^2 + 2167^2 .

It is an emirp because it is prime and its reverse (98858911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11985889 - 2¹ = 11985887 is a prime.

Together with 11985887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11985887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5992944 + 5992945.

It is an arithmetic number, because the mean of its divisors is an integer number (5992945).

Almost surely, 2^11985889 is an apocalyptic number.

It is an amenable number.

11985889 is a deficient number, since it is larger than the sum of its proper divisors (1).

11985889 is an equidigital number, since it uses as much as digits as its factorization.

11985889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 49.

The square root of 11985889 is about 3462.0642686120. The cubic root of 11985889 is about 228.8530740753.

The spelling of 11985889 in words is "eleven million, nine hundred eighty-five thousand, eight hundred eighty-nine".