811842 has 16 divisors (see below), whose sum is σ = 1632960. Its totient is φ = 269072.

The previous prime is 811819. The next prime is 811861. The reversal of 811842 is 248118.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 811842.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1363 + ... + 1865.

It is an arithmetic number, because the mean of its divisors is an integer number (102060).

2⁸¹¹⁸⁴² is an apocalyptic number.

811842 is an abundant number, since it is smaller than the sum of its proper divisors (821118).

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

811842 is a wasteful number, since it uses less digits than its factorization.

811842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777.

The product of its digits is 512, while the sum is 24.

The square root of 811842 is about 901.0227522100. The cubic root of 811842 is about 93.2875824524.

It can be divided in two parts, 811 and 842, that added together give a triangular number (1653 = T₅₇).

The spelling of 811842 in words is "eight hundred eleven thousand, eight hundred forty-two".