867851 has 4 divisors (see below), whose sum is σ = 880872. Its totient is φ = 854832.

The previous prime is 867829. The next prime is 867857. The reversal of 867851 is 158768.

It is a happy number.

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 867851 - 2¹⁸ = 605707 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 867851.

It is not an unprimeable number, because it can be changed into a prime (867857) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6410 + ... + 6543.

It is an arithmetic number, because the mean of its divisors is an integer number (220218).

2⁸⁶⁷⁸⁵¹ is an apocalyptic number.

867851 is a deficient number, since it is larger than the sum of its proper divisors (13021).

867851 is a wasteful number, since it uses less digits than its factorization.

867851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13020.

The product of its digits is 13440, while the sum is 35.

The square root of 867851 is about 931.5852081264. The cubic root of 867851 is about 95.3853599124.

The spelling of 867851 in words is "eight hundred sixty-seven thousand, eight hundred fifty-one".