811242 has 32 divisors (see below), whose sum is σ = 1834560. Its totient is φ = 265680.

The previous prime is 811241. The next prime is 811253. The reversal of 811242 is 242118.

It is a super-2 number, since 2×811242² = 1316227165128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (811241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4392 + ... + 4572.

It is an arithmetic number, because the mean of its divisors is an integer number (57330).

2⁸¹¹²⁴² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 811242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (917280).

811242 is an abundant number, since it is smaller than the sum of its proper divisors (1023318).

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

811242 is a wasteful number, since it uses less digits than its factorization.

811242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275 (or 269 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

The square root of 811242 is about 900.6897357026. The cubic root of 811242 is about 93.2645950796.

The spelling of 811242 in words is "eight hundred eleven thousand, two hundred forty-two".