809259540 has 48 divisors (see below), whose sum is σ = 2275947072. Its totient is φ = 214848256.

The previous prime is 809259481. The next prime is 809259541. The reversal of 809259540 is 45952908.

It is a junction number, because it is equal to n+sod(n) for n = 809259492 and 809259501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809259541) 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, 16089 + ... + 43328.

It is an arithmetic number, because the mean of its divisors is an integer number (47415564).

Almost surely, 2^809259540 is an apocalyptic number.

It is an amenable number.

809259540 is an abundant number, since it is smaller than the sum of its proper divisors (1466687532).

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

809259540 is a wasteful number, since it uses less digits than its factorization.

809259540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59656 (or 59654 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 42.

The square root of 809259540 is about 28447.4874110175. The cubic root of 809259540 is about 931.8856181044.

The spelling of 809259540 in words is "eight hundred nine million, two hundred fifty-nine thousand, five hundred forty".