809986956 has 24 divisors (see below), whose sum is σ = 1892278080. Its totient is φ = 269665872.

The previous prime is 809986951. The next prime is 809986963. The reversal of 809986956 is 659689908.

It is a self number, because there is not a number n which added to its sum of digits gives 809986956.

It is not an unprimeable number, because it can be changed into a prime (809986951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30886 + ... + 50733.

It is an arithmetic number, because the mean of its divisors is an integer number (78844920).

Almost surely, 2^809986956 is an apocalyptic number.

It is an amenable number.

809986956 is an abundant number, since it is smaller than the sum of its proper divisors (1082291124).

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

809986956 is a wasteful number, since it uses less digits than its factorization.

809986956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82453 (or 82451 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 60.

The square root of 809986956 is about 28460.2697808717. The cubic root of 809986956 is about 932.1647479641.

The spelling of 809986956 in words is "eight hundred nine million, nine hundred eighty-six thousand, nine hundred fifty-six".