867865 has 4 divisors (see below), whose sum is σ = 1041444. Its totient is φ = 694288.

The previous prime is 867857. The next prime is 867871. The reversal of 867865 is 568768.

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

It can be written as a sum of positive squares in 2 ways, for example, as 100489 + 767376 = 317^2 + 876^2 .

It is a cyclic number.

It is not a de Polignac number, because 867865 - 2³ = 867857 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

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 3 ways as a sum of consecutive naturals, for example, 86782 + ... + 86791.

It is an arithmetic number, because the mean of its divisors is an integer number (260361).

2⁸⁶⁷⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

867865 is a deficient number, since it is larger than the sum of its proper divisors (173579).

867865 is a wasteful number, since it uses less digits than its factorization.

867865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173578.

The product of its digits is 80640, while the sum is 40.

The square root of 867865 is about 931.5927221699. The cubic root of 867865 is about 95.3858728222.

The spelling of 867865 in words is "eight hundred sixty-seven thousand, eight hundred sixty-five".