851859 has 6 divisors (see below), whose sum is σ = 1230476. Its totient is φ = 567900.

The previous prime is 851843. The next prime is 851863. The reversal of 851859 is 958158.

It is not a de Polignac number, because 851859 - 2⁴ = 851843 is a prime.

It is an Ulam number.

It is a Duffinian number.

851859 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (851839) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47317 + ... + 47334.

2⁸⁵¹⁸⁵⁹ is an apocalyptic number.

851859 is a deficient number, since it is larger than the sum of its proper divisors (378617).

851859 is a wasteful number, since it uses less digits than its factorization.

851859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94657 (or 94654 counting only the distinct ones).

The product of its digits is 14400, while the sum is 36.

The square root of 851859 is about 922.9620793944. The cubic root of 851859 is about 94.7958311471.

The spelling of 851859 in words is "eight hundred fifty-one thousand, eight hundred fifty-nine".