679999 has 2 divisors, whose sum is σ = 680000. Its totient is φ = 679998.

The previous prime is 679993. The next prime is 680003. The reversal of 679999 is 999976.

It is a happy number.

679999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 679999 - 2⁹ = 679487 is a prime.

It is an Ulam number.

679999 is a modest number, since divided by 999 gives 679 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339999 + 340000.

It is an arithmetic number, because the mean of its divisors is an integer number (340000).

2⁶⁷⁹⁹⁹⁹ is an apocalyptic number.

679999 is a deficient number, since it is larger than the sum of its proper divisors (1).

679999 is an equidigital number, since it uses as much as digits as its factorization.

679999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 275562, while the sum is 49.

The square root of 679999 is about 824.6205187842. The cubic root of 679999 is about 87.9365503370.

The spelling of 679999 in words is "six hundred seventy-nine thousand, nine hundred ninety-nine".