99889 has 8 divisors (see below), whose sum is σ = 107712. Its totient is φ = 92400.

The previous prime is 99881. The next prime is 99901. The reversal of 99889 is 98899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99889 - 2³ = 99881 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

99889 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 939 + ... + 1039.

It is an arithmetic number, because the mean of its divisors is an integer number (13464).

2⁹⁹⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

99889 is a deficient number, since it is larger than the sum of its proper divisors (7823).

99889 is a wasteful number, since it uses less digits than its factorization.

99889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167.

The product of its digits is 46656, while the sum is 43.

The square root of 99889 is about 316.0522108766. The cubic root of 99889 is about 46.3987080992.

Subtracting from 99889 its reverse (98899), we obtain a triangular number (990 = T₄₄).

The spelling of 99889 in words is "ninety-nine thousand, eight hundred eighty-nine".