850859 has 4 divisors (see below), whose sum is σ = 852816. Its totient is φ = 848904.

The previous prime is 850853. The next prime is 850879. The reversal of 850859 is 958058.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 958058 = 2 ⋅479029.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-850859 is a prime.

It is a super-2 number, since 2×850859² = 1447922075762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (850853) 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, 2 + ... + 1304.

It is an arithmetic number, because the mean of its divisors is an integer number (213204).

2⁸⁵⁰⁸⁵⁹ is an apocalyptic number.

850859 is a deficient number, since it is larger than the sum of its proper divisors (1957).

850859 is a wasteful number, since it uses less digits than its factorization.

850859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1956.

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 850859 is about 922.4201862492. The cubic root of 850859 is about 94.7587229132.

The spelling of 850859 in words is "eight hundred fifty thousand, eight hundred fifty-nine".