855966 has 16 divisors (see below), whose sum is σ = 1721088. Its totient is φ = 283800.

The previous prime is 855947. The next prime is 855983. The reversal of 855966 is 669558.

It is a congruent number.

It is an unprimeable number.

855966 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1771 + ... + 2201.

It is an arithmetic number, because the mean of its divisors is an integer number (107568).

2⁸⁵⁵⁹⁶⁶ is an apocalyptic number.

855966 is an abundant number, since it is smaller than the sum of its proper divisors (865122).

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

855966 is a wasteful number, since it uses less digits than its factorization.

855966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767.

The product of its digits is 64800, while the sum is 39.

The square root of 855966 is about 925.1843059629. The cubic root of 855966 is about 94.9479308384.

The spelling of 855966 in words is "eight hundred fifty-five thousand, nine hundred sixty-six".