9987805 has 16 divisors (see below), whose sum is σ = 12446784. Its totient is φ = 7688320.

The previous prime is 9987793. The next prime is 9987827. The reversal of 9987805 is 5087899.

It is a de Polignac number, because none of the positive numbers 2^k-9987805 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16722 + ... + 17308.

It is an arithmetic number, because the mean of its divisors is an integer number (777924).

Almost surely, 2^9987805 is an apocalyptic number.

It is an amenable number.

9987805 is a deficient number, since it is larger than the sum of its proper divisors (2458979).

9987805 is a wasteful number, since it uses less digits than its factorization.

9987805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716.

The product of its (nonzero) digits is 181440, while the sum is 46.

The square root of 9987805 is about 3160.3488731468. The cubic root of 9987805 is about 215.3558556085.

The spelling of 9987805 in words is "nine million, nine hundred eighty-seven thousand, eight hundred five".