809489140 has 48 divisors (see below), whose sum is σ = 1807360128. Its totient is φ = 303864704.

The previous prime is 809489101. The next prime is 809489159. The reversal of 809489140 is 41984908.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7779 + ... + 40981.

It is an arithmetic number, because the mean of its divisors is an integer number (37653336).

Almost surely, 2^809489140 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 809489140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (903680064).

809489140 is an abundant number, since it is smaller than the sum of its proper divisors (997870988).

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

809489140 is a wasteful number, since it uses less digits than its factorization.

809489140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33288 (or 33286 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 809489140 is about 28451.5226306080. The cubic root of 809489140 is about 931.9737401039.

The spelling of 809489140 in words is "eight hundred nine million, four hundred eighty-nine thousand, one hundred forty".