9988687 has 2 divisors, whose sum is σ = 9988688. Its totient is φ = 9988686.

The previous prime is 9988633. The next prime is 9988691. The reversal of 9988687 is 7868899.

9988687 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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9988687 is a prime.

9988687 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9988607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4994343 + 4994344.

It is an arithmetic number, because the mean of its divisors is an integer number (4994344).

Almost surely, 2^9988687 is an apocalyptic number.

9988687 is a deficient number, since it is larger than the sum of its proper divisors (1).

9988687 is an equidigital number, since it uses as much as digits as its factorization.

9988687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 55.

The square root of 9988687 is about 3160.4884116225. The cubic root of 9988687 is about 215.3621946147.

The spelling of 9988687 in words is "nine million, nine hundred eighty-eight thousand, six hundred eighty-seven".