987856 has 20 divisors (see below), whose sum is σ = 1980900. Its totient is φ = 476672.

The previous prime is 987851. The next prime is 987869. The reversal of 987856 is 658789.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 379456 + 608400 = 616^2 + 780^2 .

It is an alternating number because its digits alternate between odd and even.

Its product of digits (120960) is a multiple of the sum of its prime divisors (2160).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987851) 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, 601 + ... + 1528.

It is an arithmetic number, because the mean of its divisors is an integer number (99045).

2⁹⁸⁷⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

987856 is an abundant number, since it is smaller than the sum of its proper divisors (993044).

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

987856 is a wasteful number, since it uses less digits than its factorization.

987856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2166 (or 2160 counting only the distinct ones).

The product of its digits is 120960, while the sum is 43.

The square root of 987856 is about 993.9094526163. The cubic root of 987856 is about 99.5935502240.

The spelling of 987856 in words is "nine hundred eighty-seven thousand, eight hundred fifty-six".