851994 has 48 divisors (see below), whose sum is σ = 2175264. Its totient is φ = 237600.

The previous prime is 851971. The next prime is 852011. The reversal of 851994 is 499158.

Its product of digits (12960) is a multiple of the sum of its prime divisors (360).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2409 + ... + 2739.

It is an arithmetic number, because the mean of its divisors is an integer number (45318).

2⁸⁵¹⁹⁹⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 851994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1087632).

851994 is an abundant number, since it is smaller than the sum of its proper divisors (1323270).

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

851994 is a wasteful number, since it uses less digits than its factorization.

851994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363 (or 360 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 851994 is about 923.0352105960. The cubic root of 851994 is about 94.8008385334.

Subtracting from 851994 its reverse (499158), we obtain a square (352836 = 594²).

The spelling of 851994 in words is "eight hundred fifty-one thousand, nine hundred ninety-four".