9999887999 has 4 divisors (see below), whose sum is σ = 10000439064. Its totient is φ = 9999336936.

The previous prime is 9999887959. The next prime is 9999888007. The reversal of 9999887999 is 9997889999.

9999887999 is digitally balanced in base 2, 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 9999887999 - 2²⁴ = 9983110783 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9999887999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999887959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247352 + ... + 284925.

It is an arithmetic number, because the mean of its divisors is an integer number (2500109766).

Almost surely, 2^9999887999 is an apocalyptic number.

9999887999 is a deficient number, since it is larger than the sum of its proper divisors (551065).

9999887999 is a wasteful number, since it uses less digits than its factorization.

9999887999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551064.

The product of its digits is 2142770112, while the sum is 86.

The square root of 9999887999 is about 99999.4399934320. The cubic root of 9999887999 is about 2154.4266467072.

The spelling of 9999887999 in words is "nine billion, nine hundred ninety-nine million, eight hundred eighty-seven thousand, nine hundred ninety-nine".