867691 has 12 divisors (see below), whose sum is σ = 976752. Its totient is φ = 770000.

The previous prime is 867689. The next prime is 867701. The reversal of 867691 is 196768.

It is not a de Polignac number, because 867691 - 2¹ = 867689 is a prime.

It is a Duffinian number.

867691 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 867691.

It is not an unprimeable number, because it can be changed into a prime (867631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8541 + ... + 8641.

It is an arithmetic number, because the mean of its divisors is an integer number (81396).

2⁸⁶⁷⁶⁹¹ is an apocalyptic number.

867691 is a deficient number, since it is larger than the sum of its proper divisors (109061).

867691 is a wasteful number, since it uses less digits than its factorization.

867691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194 (or 183 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 867691 is about 931.4993290389. The cubic root of 867691 is about 95.3794976943.

It can be divided in two parts, 86 and 7691, that added together give a palindrome (7777).

The spelling of 867691 in words is "eight hundred sixty-seven thousand, six hundred ninety-one".