851904 has 112 divisors (see below), whose sum is σ = 2743200. Its totient is φ = 258048.

The previous prime is 851899. The next prime is 851953. The reversal of 851904 is 409158.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

851904 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 15 ways as a sum of consecutive naturals, for example, 29362 + ... + 29390.

2⁸⁵¹⁹⁰⁴ 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 851904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1371600).

851904 is an abundant number, since it is smaller than the sum of its proper divisors (1891296).

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

851904 is a wasteful number, since it uses less digits than its factorization.

851904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67 (or 51 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 851904 is about 922.9864571054. The cubic root of 851904 is about 94.7975003347.

The spelling of 851904 in words is "eight hundred fifty-one thousand, nine hundred four".