788809 has 4 divisors (see below), whose sum is σ = 901504. Its totient is φ = 676116.

The previous prime is 788789. The next prime is 788813. The reversal of 788809 is 908887.

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: 908887 = 7 ⋅129841.

It is a de Polignac number, because none of the positive numbers 2^k-788809 is a prime.

It is a Duffinian number.

788809 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (788819) 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 3 ways as a sum of consecutive naturals, for example, 56337 + ... + 56350.

It is an arithmetic number, because the mean of its divisors is an integer number (225376).

2⁷⁸⁸⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

788809 is a deficient number, since it is larger than the sum of its proper divisors (112695).

788809 is a wasteful number, since it uses less digits than its factorization.

788809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112694.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 788809 is about 888.1491991777. The cubic root of 788809 is about 92.3968755776.

The spelling of 788809 in words is "seven hundred eighty-eight thousand, eight hundred nine".