865859 has 2 divisors, whose sum is σ = 865860. Its totient is φ = 865858.

The previous prime is 865847. The next prime is 865867. The reversal of 865859 is 958568.

865859 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-865859 is a prime.

It is not a weakly prime, because it can be changed into another prime (865819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432929 + 432930.

It is an arithmetic number, because the mean of its divisors is an integer number (432930).

2⁸⁶⁵⁸⁵⁹ is an apocalyptic number.

865859 is a deficient number, since it is larger than the sum of its proper divisors (1).

865859 is an equidigital number, since it uses as much as digits as its factorization.

865859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 41.

The square root of 865859 is about 930.5154485553. The cubic root of 865859 is about 95.3123238732.

Adding to 865859 its product of digits (86400), we get a palindrome (952259).

The spelling of 865859 in words is "eight hundred sixty-five thousand, eight hundred fifty-nine".