679865 has 8 divisors (see below), whose sum is σ = 820800. Its totient is φ = 540592.

The previous prime is 679859. The next prime is 679867. The reversal of 679865 is 568976.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 679865 - 2¹⁸ = 417721 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 679865.

It is not an unprimeable number, because it can be changed into a prime (679867) 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 7 ways as a sum of consecutive naturals, for example, 836 + ... + 1434.

It is an arithmetic number, because the mean of its divisors is an integer number (102600).

2⁶⁷⁹⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

679865 is a deficient number, since it is larger than the sum of its proper divisors (140935).

679865 is a wasteful number, since it uses less digits than its factorization.

679865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831.

The product of its digits is 90720, while the sum is 41.

The square root of 679865 is about 824.5392652870. The cubic root of 679865 is about 87.9307737246.

Subtracting from 679865 its reverse (568976), we obtain a square (110889 = 333²).

The spelling of 679865 in words is "six hundred seventy-nine thousand, eight hundred sixty-five".