9988899 has 4 divisors (see below), whose sum is σ = 13318536. Its totient is φ = 6659264.

The previous prime is 9988879. The next prime is 9988907.

9988899 is nontrivially palindromic in base 10.

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 9988899 - 2¹² = 9984803 is a prime.

It is an Ulam number.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9988879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1664814 + ... + 1664819.

It is an arithmetic number, because the mean of its divisors is an integer number (3329634).

Almost surely, 2^9988899 is an apocalyptic number.

9988899 is a deficient number, since it is larger than the sum of its proper divisors (3329637).

9988899 is a wasteful number, since it uses less digits than its factorization.

9988899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3329636.

The product of its digits is 3359232, while the sum is 60.

The square root of 9988899 is about 3160.5219505645. The cubic root of 9988899 is about 215.3637182205.

The spelling of 9988899 in words is "nine million, nine hundred eighty-eight thousand, eight hundred ninety-nine".