811391040 has 112 divisors (see below), whose sum is σ = 2862437760. Its totient is φ = 216368640.

The previous prime is 811390999. The next prime is 811391041. The reversal of 811391040 is 40193118.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 811390995 and 811391013.

It is not an unprimeable number, because it can be changed into a prime (811391041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38316 + ... + 55595.

It is an arithmetic number, because the mean of its divisors is an integer number (25557480).

Almost surely, 2^811391040 is an apocalyptic number.

811391040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

811391040 is an abundant number, since it is smaller than the sum of its proper divisors (2051046720).

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

811391040 is a wasteful number, since it uses less digits than its factorization.

811391040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93937 (or 93921 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 811391040 is about 28484.9265401896. The cubic root of 811391040 is about 932.7030620078.

The spelling of 811391040 in words is "eight hundred eleven million, three hundred ninety-one thousand, forty".