863871 has 8 divisors (see below), whose sum is σ = 1160064. Its totient is φ = 571800.

The previous prime is 863869. The next prime is 863879. The reversal of 863871 is 178368.

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

It is not a de Polignac number, because 863871 - 2¹ = 863869 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 501 + ... + 1406.

It is an arithmetic number, because the mean of its divisors is an integer number (145008).

2⁸⁶³⁸⁷¹ is an apocalyptic number.

863871 is a deficient number, since it is larger than the sum of its proper divisors (296193).

863871 is a wasteful number, since it uses less digits than its factorization.

863871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2061.

The product of its digits is 8064, while the sum is 33.

The square root of 863871 is about 929.4466095479. The cubic root of 863871 is about 95.2393227262.

The spelling of 863871 in words is "eight hundred sixty-three thousand, eight hundred seventy-one".