989896985 has 32 divisors (see below), whose sum is σ = 1506124800. Its totient is φ = 606605760.

The previous prime is 989896949. The next prime is 989896987. The reversal of 989896985 is 589698989.

It is not a de Polignac number, because 989896985 - 2²⁴ = 973119769 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (989896987) 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 31 ways as a sum of consecutive naturals, for example, 926 + ... + 44504.

It is an arithmetic number, because the mean of its divisors is an integer number (47066400).

Almost surely, 2^989896985 is an apocalyptic number.

It is an amenable number.

989896985 is a deficient number, since it is larger than the sum of its proper divisors (516227815).

989896985 is a wasteful number, since it uses less digits than its factorization.

989896985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43661.

The product of its digits is 100776960, while the sum is 71.

The square root of 989896985 is about 31462.6283867067. The cubic root of 989896985 is about 996.6209230331.

The spelling of 989896985 in words is "nine hundred eighty-nine million, eight hundred ninety-six thousand, nine hundred eighty-five".