679659 has 4 divisors (see below), whose sum is σ = 906216. Its totient is φ = 453104.

The previous prime is 679639. The next prime is 679669. The reversal of 679659 is 956976.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 679659 - 2⁷ = 679531 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 679659.

It is not an unprimeable number, because it can be changed into a prime (679639) 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, 113274 + ... + 113279.

It is an arithmetic number, because the mean of its divisors is an integer number (226554).

2⁶⁷⁹⁶⁵⁹ is an apocalyptic number.

679659 is a deficient number, since it is larger than the sum of its proper divisors (226557).

679659 is a wasteful number, since it uses less digits than its factorization.

679659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226556.

The product of its digits is 102060, while the sum is 42.

The square root of 679659 is about 824.4143375755. The cubic root of 679659 is about 87.9218917803.

The spelling of 679659 in words is "six hundred seventy-nine thousand, six hundred fifty-nine".