851880 has 64 divisors (see below), whose sum is σ = 2649600. Its totient is φ = 218880.

The previous prime is 851863. The next prime is 851881. The reversal of 851880 is 88158.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3606 + ... + 3834.

It is an arithmetic number, because the mean of its divisors is an integer number (41400).

2⁸⁵¹⁸⁸⁰ 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 851880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1324800).

851880 is an abundant number, since it is smaller than the sum of its proper divisors (1797720).

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

851880 is a wasteful number, since it uses less digits than its factorization.

851880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274 (or 270 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 30.

The square root of 851880 is about 922.9734557397. The cubic root of 851880 is about 94.7966101086.

The spelling of 851880 in words is "eight hundred fifty-one thousand, eight hundred eighty".