989898789 has 64 divisors (see below), whose sum is σ = 1565614080.
Its totient is φ = 550368000.
The previous prime is 989898781. The next prime is 989898809. The reversal of 989898789 is 987898989.
989898789 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.
It is not a de Polignac number, because 989898789 - 23 = 989898781 is a prime.
It is a super-2 number, since 2×9898987892 = 1959799224927333042, which contains 22 as substring.
It is an alternating number because its digits alternate between odd and even.
It is a Curzon number.
It is a self number, because there is not a number n which added to its sum of digits gives 989898789.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (989898781) 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 63 ways as a sum of consecutive naturals, for example, 1809414 + ... + 1809960.
It is an arithmetic number, because the mean of its divisors is an integer number (24462720).
Almost surely, 2989898789 is an apocalyptic number.
It is an amenable number.
989898789 is a deficient number, since it is larger than the sum of its proper divisors (575715291).
989898789 is a wasteful number, since it uses less digits than its factorization.
989898789 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 682.
The product of its digits is 188116992, while the sum is 75.
The square root of 989898789 is about 31462.6570556271.
The cubic root of 989898789 is about 996.6215284507.
The spelling of 989898789 in words is "nine hundred eighty-nine million, eight hundred ninety-eight thousand, seven hundred eighty-nine".