9987799 has 4 divisors (see below), whose sum is σ = 10090864. Its totient is φ = 9884736.

The previous prime is 9987793. The next prime is 9987827. The reversal of 9987799 is 9977899.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9987799 - 2⁷ = 9987671 is a prime.

It is a super-2 number, since 2×9987799² = 199512257728802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9987793) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 51387 + ... + 51580.

It is an arithmetic number, because the mean of its divisors is an integer number (2522716).

Almost surely, 2^9987799 is an apocalyptic number.

9987799 is a deficient number, since it is larger than the sum of its proper divisors (103065).

9987799 is a wasteful number, since it uses less digits than its factorization.

9987799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103064.

The product of its digits is 2571912, while the sum is 58.

The square root of 9987799 is about 3160.3479238843. The cubic root of 9987799 is about 215.3558124848.

The spelling of 9987799 in words is "nine million, nine hundred eighty-seven thousand, seven hundred ninety-nine".