987871 has 4 divisors (see below), whose sum is σ = 995544. Its totient is φ = 980200.

The previous prime is 987869. The next prime is 987911. The reversal of 987871 is 178789.

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 987871 - 2¹ = 987869 is a prime.

It is a super-2 number, since 2×987871² = 1951778225282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3640 + ... + 3901.

It is an arithmetic number, because the mean of its divisors is an integer number (248886).

2⁹⁸⁷⁸⁷¹ is an apocalyptic number.

987871 is a deficient number, since it is larger than the sum of its proper divisors (7673).

987871 is a wasteful number, since it uses less digits than its factorization.

987871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7672.

The product of its digits is 28224, while the sum is 40.

The square root of 987871 is about 993.9169985467. The cubic root of 987871 is about 99.5940543109.

The spelling of 987871 in words is "nine hundred eighty-seven thousand, eight hundred seventy-one".