851744 has 24 divisors (see below), whose sum is σ = 1718640. Its totient is φ = 415296.

The previous prime is 851731. The next prime is 851749. The reversal of 851744 is 447158.

It is not an unprimeable number, because it can be changed into a prime (851749) by changing a digit.

851744 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067 + ... + 1685.

It is an arithmetic number, because the mean of its divisors is an integer number (71610).

2⁸⁵¹⁷⁴⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 851744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (859320).

851744 is an abundant number, since it is smaller than the sum of its proper divisors (866896).

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

851744 is a wasteful number, since it uses less digits than its factorization.

851744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672 (or 664 counting only the distinct ones).

The product of its digits is 4480, while the sum is 29.

The square root of 851744 is about 922.8997778741. The cubic root of 851744 is about 94.7915651785.

It can be divided in two parts, 85 and 1744, that multiplied together give a triangular number (148240 = T₅₄₄).

The spelling of 851744 in words is "eight hundred fifty-one thousand, seven hundred forty-four".