679709 has 2 divisors, whose sum is σ = 679710. Its totient is φ = 679708.

The previous prime is 679699. The next prime is 679733. The reversal of 679709 is 907976.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 648025 + 31684 = 805^2 + 178^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-679709 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339854 + 339855.

It is an arithmetic number, because the mean of its divisors is an integer number (339855).

2⁶⁷⁹⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

679709 is a deficient number, since it is larger than the sum of its proper divisors (1).

679709 is an equidigital number, since it uses as much as digits as its factorization.

679709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 679709 is about 824.4446615753. Note that the first 3 decimals coincide. The cubic root of 679709 is about 87.9240477570.

The spelling of 679709 in words is "six hundred seventy-nine thousand, seven hundred nine".