989985 has 16 divisors (see below), whose sum is σ = 1635840. Its totient is φ = 510720.

The previous prime is 989981. The next prime is 989999. The reversal of 989985 is 589989.

989985 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 989985 - 2² = 989981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (989981) 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, 600 + ... + 1529.

It is an arithmetic number, because the mean of its divisors is an integer number (102240).

2⁹⁸⁹⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

989985 is a deficient number, since it is larger than the sum of its proper divisors (645855).

989985 is a wasteful number, since it uses less digits than its factorization.

989985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2168.

The product of its digits is 233280, while the sum is 48.

The square root of 989985 is about 994.9798992945. The cubic root of 989985 is about 99.6650459774.

The spelling of 989985 in words is "nine hundred eighty-nine thousand, nine hundred eighty-five".