867891 has 4 divisors (see below), whose sum is σ = 1157192. Its totient is φ = 578592.

The previous prime is 867887. The next prime is 867913. The reversal of 867891 is 198768.

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

It is not a de Polignac number, because 867891 - 2² = 867887 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (867871) 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, 144646 + ... + 144651.

It is an arithmetic number, because the mean of its divisors is an integer number (289298).

2⁸⁶⁷⁸⁹¹ is an apocalyptic number.

867891 is a deficient number, since it is larger than the sum of its proper divisors (289301).

867891 is a wasteful number, since it uses less digits than its factorization.

867891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289300.

The product of its digits is 24192, while the sum is 39.

The square root of 867891 is about 931.6066766613. The cubic root of 867891 is about 95.3868253544.

The spelling of 867891 in words is "eight hundred sixty-seven thousand, eight hundred ninety-one".