809006140 has 24 divisors (see below), whose sum is σ = 1772779680. Its totient is φ = 309532608.

The previous prime is 809006131. The next prime is 809006153. The reversal of 809006140 is 41600908.

It is a junction number, because it is equal to n+sod(n) for n = 809006099 and 809006108.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 878895 + ... + 879814.

It is an arithmetic number, because the mean of its divisors is an integer number (73865820).

Almost surely, 2^809006140 is an apocalyptic number.

It is an amenable number.

809006140 is an abundant number, since it is smaller than the sum of its proper divisors (963773540).

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

809006140 is a wasteful number, since it uses less digits than its factorization.

809006140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758741 (or 1758739 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 809006140 is about 28443.0332419030. The cubic root of 809006140 is about 931.7883421562.

The spelling of 809006140 in words is "eight hundred nine million, six thousand, one hundred forty".