999885 has 16 divisors (see below), whose sum is σ = 1612800. Its totient is φ = 528960.

The previous prime is 999883. The next prime is 999907. The reversal of 999885 is 588999.

It is not a de Polignac number, because 999885 - 2¹ = 999883 is a prime.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999883) 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 15 ways as a sum of consecutive naturals, for example, 2691 + ... + 3039.

It is an arithmetic number, because the mean of its divisors is an integer number (100800).

2⁹⁹⁹⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

999885 is a deficient number, since it is larger than the sum of its proper divisors (612915).

999885 is a wasteful number, since it uses less digits than its factorization.

999885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548.

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

The square root of 999885 is about 999.9424983468. The cubic root of 999885 is about 99.9961665197.

The spelling of 999885 in words is "nine hundred ninety-nine thousand, eight hundred eighty-five".