785609 has 4 divisors (see below), whose sum is σ = 857040. Its totient is φ = 714180.

The previous prime is 785597. The next prime is 785623. The reversal of 785609 is 906587.

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.

It is a cyclic number.

It is not a de Polignac number, because 785609 - 2⁸ = 785353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (785809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35699 + ... + 35720.

It is an arithmetic number, because the mean of its divisors is an integer number (214260).

2⁷⁸⁵⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

785609 is a deficient number, since it is larger than the sum of its proper divisors (71431).

785609 is a wasteful number, since it uses less digits than its factorization.

785609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71430.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 785609 is about 886.3458692858. The cubic root of 785609 is about 92.2717626013.

The spelling of 785609 in words is "seven hundred eighty-five thousand, six hundred nine".