989898985 has 4 divisors (see below), whose sum is σ = 1187878788.
Its totient is φ = 791919184.
The previous prime is 989898983. The next prime is 989898989. The reversal of 989898985 is 589898989.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 537868864 + 452030121 = 23192^2 + 21261^2
It is a cyclic number.
It is not a de Polignac number, because 989898985 - 21 = 989898983 is a prime.
It is an alternating number because its digits alternate between odd and even.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (989898983) 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 3 ways as a sum of consecutive naturals, for example, 98989894 + ... + 98989903.
It is an arithmetic number, because the mean of its divisors is an integer number (296969697).
Almost surely, 2989898985 is an apocalyptic number.
It is an amenable number.
989898985 is a deficient number, since it is larger than the sum of its proper divisors (197979803).
989898985 is a wasteful number, since it uses less digits than its factorization.
989898985 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 197979802.
The product of its digits is 134369280, while the sum is 73.
The square root of 989898985 is about 31462.6601704306.
The cubic root of 989898985 is about 996.6215942277.
The spelling of 989898985 in words is "nine hundred eighty-nine million, eight hundred ninety-eight thousand, nine hundred eighty-five".