679885 has 4 divisors (see below), whose sum is σ = 815868. Its totient is φ = 543904.

The previous prime is 679883. The next prime is 679891. The reversal of 679885 is 588976.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 447561 + 232324 = 669^2 + 482^2 .

It is a cyclic number.

It is not a de Polignac number, because 679885 - 2¹ = 679883 is a prime.

It is a super-2 number, since 2×679885² = 924487226450, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679883) 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, 67984 + ... + 67993.

It is an arithmetic number, because the mean of its divisors is an integer number (203967).

2⁶⁷⁹⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

679885 is a deficient number, since it is larger than the sum of its proper divisors (135983).

679885 is a wasteful number, since it uses less digits than its factorization.

679885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135982.

The product of its digits is 120960, while the sum is 43.

The square root of 679885 is about 824.5513931830. The cubic root of 679885 is about 87.9316359538.

Subtracting from 679885 its reverse (588976), we obtain a palindrome (90909).

The spelling of 679885 in words is "six hundred seventy-nine thousand, eight hundred eighty-five".