9986987 has 2 divisors, whose sum is σ = 9986988. Its totient is φ = 9986986.

The previous prime is 9986941. The next prime is 9986993. The reversal of 9986987 is 7896899.

9986987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (7896899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9986987 - 2⁸ = 9986731 is a prime.

It is not a weakly prime, because it can be changed into another prime (9986917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4993493 + 4993494.

It is an arithmetic number, because the mean of its divisors is an integer number (4993494).

Almost surely, 2^9986987 is an apocalyptic number.

9986987 is a deficient number, since it is larger than the sum of its proper divisors (1).

9986987 is an equidigital number, since it uses as much as digits as its factorization.

9986987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 56.

The square root of 9986987 is about 3160.2194544050. The cubic root of 9986987 is about 215.3499762420.

The spelling of 9986987 in words is "nine million, nine hundred eighty-six thousand, nine hundred eighty-seven".