809999993 has 8 divisors (see below), whose sum is σ = 922055616. Its totient is φ = 704347600.

The previous prime is 809999989. The next prime is 809999999. The reversal of 809999993 is 399999908.

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

It is not a de Polignac number, because 809999993 - 2² = 809999989 is a prime.

It is a Duffinian number.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 1600538 + ... + 1601043.

It is an arithmetic number, because the mean of its divisors is an integer number (115256952).

Almost surely, 2^809999993 is an apocalyptic number.

It is an amenable number.

809999993 is a deficient number, since it is larger than the sum of its proper divisors (112055623).

809999993 is a wasteful number, since it uses less digits than its factorization.

809999993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3201615.

The product of its (nonzero) digits is 12754584, while the sum is 65.

The square root of 809999993 is about 28460.4988185379. The cubic root of 809999993 is about 932.1697491009.

The spelling of 809999993 in words is "eight hundred nine million, nine hundred ninety-nine thousand, nine hundred ninety-three".