812166 has 16 divisors (see below), whose sum is σ = 1634304. Its totient is φ = 269064.

The previous prime is 812137. The next prime is 812167. The reversal of 812166 is 661218.

It is a super-2 number, since 2×812166² = 1319227223112, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 812166.

It is not an unprimeable number, because it can be changed into a prime (812167) by changing a digit.

812166 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, 1035 + ... + 1641.

It is an arithmetic number, because the mean of its divisors is an integer number (102144).

2⁸¹²¹⁶⁶ is an apocalyptic number.

812166 is an abundant number, since it is smaller than the sum of its proper divisors (822138).

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

812166 is a wasteful number, since it uses less digits than its factorization.

812166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835.

The product of its digits is 576, while the sum is 24.

The square root of 812166 is about 901.2025299565. The cubic root of 812166 is about 93.2999909246.

The spelling of 812166 in words is "eight hundred twelve thousand, one hundred sixty-six".