851916 has 48 divisors (see below), whose sum is σ = 2207744. Its totient is φ = 254016.

The previous prime is 851899. The next prime is 851953. The reversal of 851916 is 619158.

It is a happy number.

It is a zygodrome in base 2.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 851916.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6645 + ... + 6771.

2⁸⁵¹⁹¹⁶ is an apocalyptic number.

851916 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 851916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1103872).

851916 is an abundant number, since it is smaller than the sum of its proper divisors (1355828).

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

851916 is a wasteful number, since it uses less digits than its factorization.

851916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190 (or 188 counting only the distinct ones).

The product of its digits is 2160, while the sum is 30.

The square root of 851916 is about 922.9929577196. The cubic root of 851916 is about 94.7979454414.

The spelling of 851916 in words is "eight hundred fifty-one thousand, nine hundred sixteen".