799909 has 4 divisors (see below), whose sum is σ = 872640. Its totient is φ = 727180.

The previous prime is 799891. The next prime is 799921. The reversal of 799909 is 909997.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 909997 = 11 ⋅82727.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-799909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (799949) 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, 36349 + ... + 36370.

It is an arithmetic number, because the mean of its divisors is an integer number (218160).

2⁷⁹⁹⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

799909 is a deficient number, since it is larger than the sum of its proper divisors (72731).

799909 is a wasteful number, since it uses less digits than its factorization.

799909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72730.

The product of its (nonzero) digits is 45927, while the sum is 43.

The square root of 799909 is about 894.3763190067. The cubic root of 799909 is about 92.8282566673.

The spelling of 799909 in words is "seven hundred ninety-nine thousand, nine hundred nine".