9987899 has 4 divisors (see below), whose sum is σ = 10005336. Its totient is φ = 9970464.

The previous prime is 9987893. The next prime is 9987931.

9987899 is nontrivially palindromic in base 10.

9987899 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 9987899 - 2⁸ = 9987643 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9987893) 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, 7829 + ... + 9014.

It is an arithmetic number, because the mean of its divisors is an integer number (2501334).

Almost surely, 2^9987899 is an apocalyptic number.

9987899 is a deficient number, since it is larger than the sum of its proper divisors (17437).

9987899 is a wasteful number, since it uses less digits than its factorization.

9987899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17436.

The product of its digits is 2939328, while the sum is 59.

The square root of 9987899 is about 3160.3637448876. The cubic root of 9987899 is about 215.3565312120.

The spelling of 9987899 in words is "nine million, nine hundred eighty-seven thousand, eight hundred ninety-nine".