987859 has 4 divisors (see below), whose sum is σ = 992200. Its totient is φ = 983520.

The previous prime is 987851. The next prime is 987869. The reversal of 987859 is 958789.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 987859 - 2³ = 987851 is a prime.

It is a Duffinian number.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1809 + ... + 2290.

It is an arithmetic number, because the mean of its divisors is an integer number (248050).

2⁹⁸⁷⁸⁵⁹ is an apocalyptic number.

987859 is a deficient number, since it is larger than the sum of its proper divisors (4341).

987859 is a wasteful number, since it uses less digits than its factorization.

987859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4340.

The product of its digits is 181440, while the sum is 46.

The square root of 987859 is about 993.9109618069. The cubic root of 987859 is about 99.5936510418.

The spelling of 987859 in words is "nine hundred eighty-seven thousand, eight hundred fifty-nine".