851966 has 8 divisors (see below), whose sum is σ = 1333584. Its totient is φ = 407440.

The previous prime is 851957. The next prime is 851971. The reversal of 851966 is 669158.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9215 + ... + 9306.

It is an arithmetic number, because the mean of its divisors is an integer number (166698).

2⁸⁵¹⁹⁶⁶ is an apocalyptic number.

851966 is a deficient number, since it is larger than the sum of its proper divisors (481618).

851966 is a wasteful number, since it uses less digits than its factorization.

851966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18546.

The product of its digits is 12960, while the sum is 35.

The square root of 851966 is about 923.0200431193. The cubic root of 851966 is about 94.7998000079.

The spelling of 851966 in words is "eight hundred fifty-one thousand, nine hundred sixty-six".