809855040 has 112 divisors (see below), whose sum is σ = 2577803328. Its totient is φ = 215414784.

The previous prime is 809855021. The next prime is 809855041. The reversal of 809855040 is 40558908.

It is a self number, because there is not a number n which added to its sum of digits gives 809855040.

It is not an unprimeable number, because it can be changed into a prime (809855041) 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, 501274 + ... + 502886.

Almost surely, 2^809855040 is an apocalyptic number.

809855040 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 809855040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1288901664).

809855040 is an abundant number, since it is smaller than the sum of its proper divisors (1767948288).

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

809855040 is a wasteful number, since it uses less digits than its factorization.

809855040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2156 (or 2146 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 809855040 is about 28457.9521399555. The cubic root of 809855040 is about 932.1141405150.

The spelling of 809855040 in words is "eight hundred nine million, eight hundred fifty-five thousand, forty".