865687 has 2 divisors, whose sum is σ = 865688. Its totient is φ = 865686.

The previous prime is 865681. The next prime is 865717. The reversal of 865687 is 786568.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 865687 - 2¹⁵ = 832919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (865681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432843 + 432844.

It is an arithmetic number, because the mean of its divisors is an integer number (432844).

2⁸⁶⁵⁶⁸⁷ is an apocalyptic number.

865687 is a deficient number, since it is larger than the sum of its proper divisors (1).

865687 is an equidigital number, since it uses as much as digits as its factorization.

865687 is an evil number, because the sum of its binary digits is even.

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

The square root of 865687 is about 930.4230220711. The cubic root of 865687 is about 95.3060122969.

The spelling of 865687 in words is "eight hundred sixty-five thousand, six hundred eighty-seven".