7987871 has 4 divisors (see below), whose sum is σ = 8062632. Its totient is φ = 7913112.

The previous prime is 7987867. The next prime is 7987883. The reversal of 7987871 is 1787897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1787897 = 43 ⋅41579.

It is a cyclic number.

It is not a de Polignac number, because 7987871 - 2² = 7987867 is a prime.

It is a super-2 number, since 2×7987871² = 127612166225282, 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 (7981871) 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, 37220 + ... + 37433.

It is an arithmetic number, because the mean of its divisors is an integer number (2015658).

Almost surely, 2^7987871 is an apocalyptic number.

7987871 is a deficient number, since it is larger than the sum of its proper divisors (74761).

7987871 is a wasteful number, since it uses less digits than its factorization.

7987871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74760.

The product of its digits is 197568, while the sum is 47.

The square root of 7987871 is about 2826.2821869021. The cubic root of 7987871 is about 199.8988738762.

The spelling of 7987871 in words is "seven million, nine hundred eighty-seven thousand, eight hundred seventy-one".