809771812 has 48 divisors (see below), whose sum is σ = 1549836288. Its totient is φ = 368686080.

The previous prime is 809771803. The next prime is 809771819. The reversal of 809771812 is 218177908.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (809771819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 352933 + ... + 355219.

It is an arithmetic number, because the mean of its divisors is an integer number (32288256).

Almost surely, 2^809771812 is an apocalyptic number.

809771812 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

809771812 is a deficient number, since it is larger than the sum of its proper divisors (740064476).

809771812 is a wasteful number, since it uses less digits than its factorization.

809771812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2476 (or 2474 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 43.

The square root of 809771812 is about 28456.4898046122. The cubic root of 809771812 is about 932.0822086056.

The spelling of 809771812 in words is "eight hundred nine million, seven hundred seventy-one thousand, eight hundred twelve".