811982 has 4 divisors (see below), whose sum is σ = 1217976. Its totient is φ = 405990.

The previous prime is 811981. The next prime is 811991. The reversal of 811982 is 289118.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202994 + ... + 202997.

It is an arithmetic number, because the mean of its divisors is an integer number (304494).

2⁸¹¹⁹⁸² is an apocalyptic number.

811982 is a deficient number, since it is larger than the sum of its proper divisors (405994).

811982 is a wasteful number, since it uses less digits than its factorization.

811982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405993.

The product of its digits is 1152, while the sum is 29.

The square root of 811982 is about 901.1004383530. The cubic root of 811982 is about 93.2929445429.

The spelling of 811982 in words is "eight hundred eleven thousand, nine hundred eighty-two".