857859 has 4 divisors (see below), whose sum is σ = 1143816. Its totient is φ = 571904.

The previous prime is 857851. The next prime is 857867. The reversal of 857859 is 958758.

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

It is an interprime number because it is at equal distance from previous prime (857851) and next prime (857867).

It is a cyclic number.

It is not a de Polignac number, because 857859 - 2³ = 857851 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 857859.

It is not an unprimeable number, because it can be changed into a prime (857851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142974 + ... + 142979.

It is an arithmetic number, because the mean of its divisors is an integer number (285954).

2⁸⁵⁷⁸⁵⁹ is an apocalyptic number.

857859 is a deficient number, since it is larger than the sum of its proper divisors (285957).

857859 is a wasteful number, since it uses less digits than its factorization.

857859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285956.

The product of its digits is 100800, while the sum is 42.

The square root of 857859 is about 926.2067803682. The cubic root of 857859 is about 95.0178729069.

The spelling of 857859 in words is "eight hundred fifty-seven thousand, eight hundred fifty-nine".