679509 has 10 divisors (see below), whose sum is σ = 1015190. Its totient is φ = 452952.

The previous prime is 679501. The next prime is 679517. The reversal of 679509 is 905976.

It is an interprime number because it is at equal distance from previous prime (679501) and next prime (679517).

It can be written as a sum of positive squares in only one way, i.e., 656100 + 23409 = 810^2 + 153^2 .

It is not a de Polignac number, because 679509 - 2³ = 679501 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 (679501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4114 + ... + 4275.

It is an arithmetic number, because the mean of its divisors is an integer number (101519).

2⁶⁷⁹⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

679509 is a deficient number, since it is larger than the sum of its proper divisors (335681).

679509 is an equidigital number, since it uses as much as digits as its factorization.

679509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8401 (or 8392 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 679509 is about 824.3233588829. The cubic root of 679509 is about 87.9154232159.

The spelling of 679509 in words is "six hundred seventy-nine thousand, five hundred nine".