998989899 has 16 divisors (see below), whose sum is σ = 1388414208. Its totient is φ = 638317152.

The previous prime is 998989811. The next prime is 998989903.

998989899 is nontrivially palindromic in base 10.

998989899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 998989899 - 2¹⁶ = 998924363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (998989399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59727 + ... + 74600.

It is an arithmetic number, because the mean of its divisors is an integer number (86775888).

Almost surely, 2^998989899 is an apocalyptic number.

998989899 is a deficient number, since it is larger than the sum of its proper divisors (389424309).

998989899 is a wasteful number, since it uses less digits than its factorization.

998989899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134434.

The product of its digits is 272097792, while the sum is 78.

The square root of 998989899 is about 31606.8014674057. The cubic root of 998989899 is about 999.6631862359.

The spelling of 998989899 in words is "nine hundred ninety-eight million, nine hundred eighty-nine thousand, eight hundred ninety-nine".