9985889 has 16 divisors (see below), whose sum is σ = 10789200. Its totient is φ = 9225216.

The previous prime is 9985879. The next prime is 9985891. The reversal of 9985889 is 9885899.

9985889 = T₂₄₂ + T₂₄₃ + ... + T₄₁₉.

9985889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 289 + 9985600 = 17^2 + 3160^2 .

It is a cyclic number.

It is not a de Polignac number, because 9985889 - 2¹⁶ = 9920353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9985879) 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, 112157 + ... + 112245.

It is an arithmetic number, because the mean of its divisors is an integer number (674325).

Almost surely, 2^9985889 is an apocalyptic number.

It is an amenable number.

9985889 is a deficient number, since it is larger than the sum of its proper divisors (803311).

9985889 is a wasteful number, since it uses less digits than its factorization.

9985889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244.

The product of its digits is 1866240, while the sum is 56.

The square root of 9985889 is about 3160.0457275172. The cubic root of 9985889 is about 215.3420838737.

The spelling of 9985889 in words is "nine million, nine hundred eighty-five thousand, eight hundred eighty-nine".