809999994 has 8 divisors (see below), whose sum is σ = 1620000000. Its totient is φ = 269999996.

The previous prime is 809999989. The next prime is 809999999. The reversal of 809999994 is 499999908.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (809999989) and next prime (809999999).

It is a sphenic number, since it is the product of 3 distinct primes.

809999994 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (809999999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67499994 + ... + 67500005.

It is an arithmetic number, because the mean of its divisors is an integer number (202500000).

Almost surely, 2^809999994 is an apocalyptic number.

809999994 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

809999994 is a wasteful number, since it uses less digits than its factorization.

809999994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135000004.

The product of its (nonzero) digits is 17006112, while the sum is 66.

The square root of 809999994 is about 28460.4988361062. The cubic root of 809999994 is about 932.1697494845.

The spelling of 809999994 in words is "eight hundred nine million, nine hundred ninety-nine thousand, nine hundred ninety-four".