790809 has 16 divisors (see below), whose sum is σ = 1122432. Its totient is φ = 494208.

The previous prime is 790793. The next prime is 790817. The reversal of 790809 is 908097.

It is not a de Polignac number, because 790809 - 2⁴ = 790793 is a prime.

It is an Ulam number.

790809 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 790809.

It is not an unprimeable number, because it can be changed into a prime (790819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4959 + ... + 5115.

It is an arithmetic number, because the mean of its divisors is an integer number (70152).

2⁷⁹⁰⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

790809 is a deficient number, since it is larger than the sum of its proper divisors (331623).

790809 is a wasteful number, since it uses less digits than its factorization.

790809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 790809 is about 889.2744233362. The cubic root of 790809 is about 92.4748994470.

The spelling of 790809 in words is "seven hundred ninety thousand, eight hundred nine".