679823 has 2 divisors, whose sum is σ = 679824. Its totient is φ = 679822.

The previous prime is 679807. The next prime is 679829. The reversal of 679823 is 328976.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 679823 - 2⁴ = 679807 is a prime.

It is a super-2 number, since 2×679823² = 924318622658, which contains 22 as substring.

It is a Sophie Germain prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679829) 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 as a sum of consecutive naturals, namely, 339911 + 339912.

It is an arithmetic number, because the mean of its divisors is an integer number (339912).

2⁶⁷⁹⁸²³ is an apocalyptic number.

679823 is a deficient number, since it is larger than the sum of its proper divisors (1).

679823 is an equidigital number, since it uses as much as digits as its factorization.

679823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 35.

The square root of 679823 is about 824.5137961247. The cubic root of 679823 is about 87.9289629884.

The spelling of 679823 in words is "six hundred seventy-nine thousand, eight hundred twenty-three".