851872 has 24 divisors (see below), whose sum is σ = 1917216. Its totient is φ = 364992.

The previous prime is 851863. The next prime is 851881. The reversal of 851872 is 278158.

It is an interprime number because it is at equal distance from previous prime (851863) and next prime (851881).

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

851872 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1678 + ... + 2125.

It is an arithmetic number, because the mean of its divisors is an integer number (79884).

2⁸⁵¹⁸⁷² is an apocalyptic number.

It is an amenable number.

851872 is an abundant number, since it is smaller than the sum of its proper divisors (1065344).

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

851872 is a wasteful number, since it uses less digits than its factorization.

851872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3820 (or 3812 counting only the distinct ones).

The product of its digits is 4480, while the sum is 31.

The square root of 851872 is about 922.9691219104. The cubic root of 851872 is about 94.7963133629.

The spelling of 851872 in words is "eight hundred fifty-one thousand, eight hundred seventy-two".