851844 has 24 divisors (see below), whose sum is σ = 2271808. Its totient is φ = 243360.

The previous prime is 851843. The next prime is 851863. The reversal of 851844 is 448158.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (851843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4987 + ... + 5154.

2⁸⁵¹⁸⁴⁴ is an apocalyptic number.

851844 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

851844 is an abundant number, since it is smaller than the sum of its proper divisors (1419964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

851844 is a wasteful number, since it uses less digits than its factorization.

851844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10155 (or 10153 counting only the distinct ones).

The product of its digits is 5120, while the sum is 30.

The square root of 851844 is about 922.9539533476. The cubic root of 851844 is about 94.7952747382.

The spelling of 851844 in words is "eight hundred fifty-one thousand, eight hundred forty-four".