851656 has 32 divisors (see below), whose sum is σ = 1814400. Its totient is φ = 371520.

The previous prime is 851647. The next prime is 851659. The reversal of 851656 is 656158.

It is not an unprimeable number, because it can be changed into a prime (851659) by changing a digit.

851656 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 7 ways as a sum of consecutive naturals, for example, 1761 + ... + 2191.

It is an arithmetic number, because the mean of its divisors is an integer number (56700).

2⁸⁵¹⁶⁵⁶ 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 851656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (907200).

851656 is an abundant number, since it is smaller than the sum of its proper divisors (962744).

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

851656 is a wasteful number, since it uses less digits than its factorization.

851656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469 (or 465 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The square root of 851656 is about 922.8521008266. The cubic root of 851656 is about 94.7883005259.

The spelling of 851656 in words is "eight hundred fifty-one thousand, six hundred fifty-six".