851849 has 4 divisors (see below), whose sum is σ = 879360. Its totient is φ = 824340.

The previous prime is 851843. The next prime is 851863. The reversal of 851849 is 948158.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (851843) 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, 13709 + ... + 13770.

It is an arithmetic number, because the mean of its divisors is an integer number (219840).

2⁸⁵¹⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

851849 is a deficient number, since it is larger than the sum of its proper divisors (27511).

851849 is a wasteful number, since it uses less digits than its factorization.

851849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27510.

The product of its digits is 11520, while the sum is 35.

The square root of 851849 is about 922.9566620378. The cubic root of 851849 is about 94.7954602086.

The spelling of 851849 in words is "eight hundred fifty-one thousand, eight hundred forty-nine".