797809 has 4 divisors (see below), whose sum is σ = 812916. Its totient is φ = 782704.

The previous prime is 797773. The next prime is 797813. The reversal of 797809 is 908797.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 685584 + 112225 = 828^2 + 335^2 .

It is not a de Polignac number, because 797809 - 2⁷ = 797681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (797869) 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, 7474 + ... + 7579.

It is an arithmetic number, because the mean of its divisors is an integer number (203229).

2⁷⁹⁷⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

797809 is a deficient number, since it is larger than the sum of its proper divisors (15107).

797809 is a wasteful number, since it uses less digits than its factorization.

797809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15106.

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 797809 is about 893.2015450054. The cubic root of 797809 is about 92.7469515106.

The spelling of 797809 in words is "seven hundred ninety-seven thousand, eight hundred nine".