871665 has 8 divisors (see below), whose sum is σ = 1394688. Its totient is φ = 464880.

The previous prime is 871657. The next prime is 871679. The reversal of 871665 is 566178.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 871665 - 2³ = 871657 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 29041 + ... + 29070.

It is an arithmetic number, because the mean of its divisors is an integer number (174336).

2⁸⁷¹⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

871665 is a deficient number, since it is larger than the sum of its proper divisors (523023).

871665 is a wasteful number, since it uses less digits than its factorization.

871665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58119.

The product of its digits is 10080, while the sum is 33.

The square root of 871665 is about 933.6300123711. The cubic root of 871665 is about 95.5248877508.

The spelling of 871665 in words is "eight hundred seventy-one thousand, six hundred sixty-five".