999889 has 8 divisors (see below), whose sum is σ = 1155168. Its totient is φ = 855360.

The previous prime is 999883. The next prime is 999907. The reversal of 999889 is 988999.

999889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 999889 - 2⁹ = 999377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2487 + ... + 2860.

It is an arithmetic number, because the mean of its divisors is an integer number (144396).

2⁹⁹⁹⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

999889 is a deficient number, since it is larger than the sum of its proper divisors (155279).

999889 is a wasteful number, since it uses less digits than its factorization.

999889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5375.

The product of its digits is 419904, while the sum is 52.

The square root of 999889 is about 999.9444984598. The cubic root of 999889 is about 99.9962998631.

The spelling of 999889 in words is "nine hundred ninety-nine thousand, eight hundred eighty-nine".