849859 has 4 divisors (see below), whose sum is σ = 851704. Its totient is φ = 848016.

The previous prime is 849857. The next prime is 849869. The reversal of 849859 is 958948.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 849859 - 2¹ = 849857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (849857) 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 in 3 ways as a sum of consecutive naturals, for example, 439 + ... + 1375.

It is an arithmetic number, because the mean of its divisors is an integer number (212926).

2⁸⁴⁹⁸⁵⁹ is an apocalyptic number.

849859 is a deficient number, since it is larger than the sum of its proper divisors (1845).

849859 is an equidigital number, since it uses as much as digits as its factorization.

849859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1844.

The product of its digits is 103680, while the sum is 43.

The square root of 849859 is about 921.8779745715. The cubic root of 849859 is about 94.7215855928.

The spelling of 849859 in words is "eight hundred forty-nine thousand, eight hundred fifty-nine".