811740 has 48 divisors (see below), whose sum is σ = 2314368. Its totient is φ = 212544.

The previous prime is 811729. The next prime is 811747. The reversal of 811740 is 47118.

811740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811747) by changing a digit.

811740 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, 4899 + ... + 5061.

It is an arithmetic number, because the mean of its divisors is an integer number (48216).

2⁸¹¹⁷⁴⁰ 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 811740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1157184).

811740 is an abundant number, since it is smaller than the sum of its proper divisors (1502628).

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

811740 is a wasteful number, since it uses less digits than its factorization.

811740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 811740 is about 900.9661480877. The cubic root of 811740 is about 93.2836753983.

Adding to 811740 its reverse (47118), we get a palindrome (858858).

It can be divided in two parts, 811 and 740, that added together give a palindrome (1551).

The spelling of 811740 in words is "eight hundred eleven thousand, seven hundred forty".