811040 has 48 divisors (see below), whose sum is σ = 1982232. Its totient is φ = 313344.

The previous prime is 811039. The next prime is 811067. The reversal of 811040 is 40118.

811040 = T₇₉ + T₈₀ + ... + T₁₇₄.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 781456 + 29584 = 884^2 + 172^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5852 + ... + 5988.

2⁸¹¹⁰⁴⁰ is an apocalyptic number.

811040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 811040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (991116).

811040 is an abundant number, since it is smaller than the sum of its proper divisors (1171192).

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

811040 is a wasteful number, since it uses less digits than its factorization.

811040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 811040 is about 900.5775924372. The cubic root of 811040 is about 93.2568534472.

Adding to 811040 its reverse (40118), we get a palindrome (851158).

The spelling of 811040 in words is "eight hundred eleven thousand, forty".