809788994 has 12 divisors (see below), whose sum is σ = 1412999334. Its totient is φ = 347052384.

The previous prime is 809788981. The next prime is 809788997. The reversal of 809788994 is 499887908.

It can be written as a sum of positive squares in only one way, i.e., 658179025 + 151609969 = 25655^2 + 12313^2 .

It is not an unprimeable number, because it can be changed into a prime (809788997) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4131479 + ... + 4131674.

Almost surely, 2^809788994 is an apocalyptic number.

809788994 is a deficient number, since it is larger than the sum of its proper divisors (603210340).

809788994 is a wasteful number, since it uses less digits than its factorization.

809788994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8263169 (or 8263162 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 62.

The square root of 809788994 is about 28456.7917025093. The cubic root of 809788994 is about 932.0888009661.

The spelling of 809788994 in words is "eight hundred nine million, seven hundred eighty-eight thousand, nine hundred ninety-four".