9899889989 has 8 divisors (see below), whose sum is σ = 10930000032. Its totient is φ = 8891466640.

The previous prime is 9899889929. The next prime is 9899890001.

9899889989 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9899889989 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 9899889989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9899889919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5420714 + ... + 5422539.

It is an arithmetic number, because the mean of its divisors is an integer number (1366250004).

Almost surely, 2^9899889989 is an apocalyptic number.

It is an amenable number.

9899889989 is a deficient number, since it is larger than the sum of its proper divisors (1030110043).

9899889989 is a wasteful number, since it uses less digits than its factorization.

9899889989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10843347.

The product of its digits is 2176782336, while the sum is 86.

The square root of 9899889989 is about 99498.1908830507. The cubic root of 9899889989 is about 2147.2212154936.

The spelling of 9899889989 in words is "nine billion, eight hundred ninety-nine million, eight hundred eighty-nine thousand, nine hundred eighty-nine".