11985887 has 2 divisors, whose sum is σ = 11985888. Its totient is φ = 11985886.

The previous prime is 11985877. The next prime is 11985889. The reversal of 11985887 is 78858911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11985887 - 2¹² = 11981791 is a prime.

It is a super-2 number, since 2×11985887² = 287322974353538, which contains 22 as substring.

Together with 11985889, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11985889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5992943 + 5992944.

It is an arithmetic number, because the mean of its divisors is an integer number (5992944).

Almost surely, 2^11985887 is an apocalyptic number.

11985887 is a deficient number, since it is larger than the sum of its proper divisors (1).

11985887 is an equidigital number, since it uses as much as digits as its factorization.

11985887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 47.

The square root of 11985887 is about 3462.0639797670. The cubic root of 11985887 is about 228.8530613463.

The spelling of 11985887 in words is "eleven million, nine hundred eighty-five thousand, eight hundred eighty-seven".