811966 has 8 divisors (see below), whose sum is σ = 1225224. Its totient is φ = 403560.

The previous prime is 811961. The next prime is 811981. The reversal of 811966 is 669118.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 760 + ... + 1483.

It is an arithmetic number, because the mean of its divisors is an integer number (153153).

2⁸¹¹⁹⁶⁶ is an apocalyptic number.

811966 is a deficient number, since it is larger than the sum of its proper divisors (413258).

811966 is a wasteful number, since it uses less digits than its factorization.

811966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2426.

The product of its digits is 2592, while the sum is 31.

The square root of 811966 is about 901.0915602756. The cubic root of 811966 is about 93.2923317638.

The spelling of 811966 in words is "eight hundred eleven thousand, nine hundred sixty-six".