851660 has 24 divisors (see below), whose sum is σ = 1811040. Its totient is φ = 336384.

The previous prime is 851659. The next prime is 851671. The reversal of 851660 is 66158.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1721 + ... + 2159.

It is an arithmetic number, because the mean of its divisors is an integer number (75460).

2⁸⁵¹⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

851660 is an abundant number, since it is smaller than the sum of its proper divisors (959380).

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

851660 is a wasteful number, since it uses less digits than its factorization.

851660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545 (or 543 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 851660 is about 922.8542680185. The cubic root of 851660 is about 94.7884489240.

The spelling of 851660 in words is "eight hundred fifty-one thousand, six hundred sixty".