9999899 has 24 divisors (see below), whose sum is σ = 12648960.
Its totient is φ = 7738848.
The previous prime is 9999889. The next prime is 9999901. The reversal of 9999899 is 9989999.
9999899 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
It is not a de Polignac number, because 9999899 - 24 = 9999883 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 (9999889) 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 23 ways as a sum of consecutive naturals, for example, 93404 + ... + 93510.
It is an arithmetic number, because the mean of its divisors is an integer number (527040).
Almost surely, 29999899 is an apocalyptic number.
9999899 is a deficient number, since it is larger than the sum of its proper divisors (2649061).
9999899 is a wasteful number, since it uses less digits than its factorization.
9999899 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 219 (or 206 counting only the distinct ones).
The product of its digits is 4251528, while the sum is 62.
The square root of 9999899 is about 3162.2616906259.
The cubic root of 9999899 is about 215.4427436744.
The spelling of 9999899 in words is "nine million, nine hundred ninety-nine thousand, eight hundred ninety-nine".