990856 has 16 divisors (see below), whose sum is σ = 1869840. Its totient is φ = 492240.

The previous prime is 990851. The next prime is 990881. The reversal of 990856 is 658099.

990856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×990856² = 1963591225472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (990851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1395 + ... + 1981.

It is an arithmetic number, because the mean of its divisors is an integer number (116865).

2⁹⁹⁰⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

990856 is a deficient number, since it is larger than the sum of its proper divisors (878984).

990856 is a wasteful number, since it uses less digits than its factorization.

990856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804 (or 800 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 990856 is about 995.4175003485. The cubic root of 990856 is about 99.6942662212.

The spelling of 990856 in words is "nine hundred ninety thousand, eight hundred fifty-six".