859823 has 2 divisors, whose sum is σ = 859824. Its totient is φ = 859822.

The previous prime is 859801. The next prime is 859841. The reversal of 859823 is 328958.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 859823 - 2⁸ = 859567 is a prime.

It is a Sophie Germain prime.

It is a plaindrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (859853) 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 as a sum of consecutive naturals, namely, 429911 + 429912.

It is an arithmetic number, because the mean of its divisors is an integer number (429912).

2⁸⁵⁹⁸²³ is an apocalyptic number.

859823 is a deficient number, since it is larger than the sum of its proper divisors (1).

859823 is an equidigital number, since it uses as much as digits as its factorization.

859823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 35.

The square root of 859823 is about 927.2664126345. The cubic root of 859823 is about 95.0903295964.

The spelling of 859823 in words is "eight hundred fifty-nine thousand, eight hundred twenty-three".