811140 has 48 divisors (see below), whose sum is σ = 2479680. Its totient is φ = 196480.

The previous prime is 811127. The next prime is 811147. The reversal of 811140 is 41118.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (811147) by changing a digit.

811140 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 15 ways as a sum of consecutive naturals, for example, 46 + ... + 1274.

It is an arithmetic number, because the mean of its divisors is an integer number (51660).

2⁸¹¹¹⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 811140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1239840).

811140 is an abundant number, since it is smaller than the sum of its proper divisors (1668540).

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

811140 is a wasteful number, since it uses less digits than its factorization.

811140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252 (or 1250 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 811140 is about 900.6331106505. The cubic root of 811140 is about 93.2606860991.

Adding to 811140 its reverse (41118), we get a palindrome (852258).

It can be divided in two parts, 81 and 1140, that added together give a palindrome (1221).

The spelling of 811140 in words is "eight hundred eleven thousand, one hundred forty".