989898909 has 16 divisors (see below), whose sum is σ = 1378156032. Its totient is φ = 630825008.

The previous prime is 989898887. The next prime is 989898929. The reversal of 989898909 is 909898989.

It is a cyclic number.

It is not a de Polignac number, because 989898909 - 2⁷ = 989898781 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989898929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127822 + ... + 135344.

It is an arithmetic number, because the mean of its divisors is an integer number (86134752).

Almost surely, 2^989898909 is an apocalyptic number.

It is an amenable number.

989898909 is a deficient number, since it is larger than the sum of its proper divisors (388257123).

989898909 is a wasteful number, since it uses less digits than its factorization.

989898909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9456.

The product of its (nonzero) digits is 30233088, while the sum is 69.

The square root of 989898909 is about 31462.6589626497. The cubic root of 989898909 is about 996.6215687223.

The spelling of 989898909 in words is "nine hundred eighty-nine million, eight hundred ninety-eight thousand, nine hundred nine".