999000856 has 16 divisors (see below), whose sum is σ = 2140716240. Its totient is φ = 428143200.

The previous prime is 999000841. The next prime is 999000901. The reversal of 999000856 is 658000999.

It is a happy number.

999000856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8919595 + ... + 8919706.

It is an arithmetic number, because the mean of its divisors is an integer number (133794765).

Almost surely, 2^999000856 is an apocalyptic number.

It is an amenable number.

999000856 is an abundant number, since it is smaller than the sum of its proper divisors (1141715384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999000856 is a wasteful number, since it uses less digits than its factorization.

999000856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17839314 (or 17839310 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 46.

The square root of 999000856 is about 31606.9747998761. The cubic root of 999000856 is about 999.6668410174. Note that the first 3 decimals are identical.

The spelling of 999000856 in words is "nine hundred ninety-nine million, eight hundred fifty-six", and thus it is an aban number.