851604 has 48 divisors (see below), whose sum is σ = 2201472. Its totient is φ = 254592.

The previous prime is 851603. The next prime is 851623. The reversal of 851604 is 406158.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8217 + ... + 8319.

It is an arithmetic number, because the mean of its divisors is an integer number (45864).

2⁸⁵¹⁶⁰⁴ 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 851604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1100736).

851604 is an abundant number, since it is smaller than the sum of its proper divisors (1349868).

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

851604 is a wasteful number, since it uses less digits than its factorization.

851604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 851604 is about 922.8239268680. The cubic root of 851604 is about 94.7863713072.

The spelling of 851604 in words is "eight hundred fifty-one thousand, six hundred four".