809036140 has 96 divisors (see below), whose sum is σ = 1924392960. Its totient is φ = 283046400.

The previous prime is 809036119. The next prime is 809036141. The reversal of 809036140 is 41630908.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (809036141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2134471 + ... + 2134849.

It is an arithmetic number, because the mean of its divisors is an integer number (20045760).

Almost surely, 2^809036140 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 809036140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (962196480).

809036140 is an abundant number, since it is smaller than the sum of its proper divisors (1115356820).

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

809036140 is a wasteful number, since it uses less digits than its factorization.

809036140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743 (or 741 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 809036140 is about 28443.5606069282. The cubic root of 809036140 is about 931.7998597057.

The spelling of 809036140 in words is "eight hundred nine million, thirty-six thousand, one hundred forty".