680399 has 2 divisors, whose sum is σ = 680400. Its totient is φ = 680398.

The previous prime is 680387. The next prime is 680401. The reversal of 680399 is 993086.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 680399 - 2¹⁶ = 614863 is a prime.

Together with 680401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340199 + 340200.

It is an arithmetic number, because the mean of its divisors is an integer number (340200).

2⁶⁸⁰³⁹⁹ is an apocalyptic number.

680399 is a deficient number, since it is larger than the sum of its proper divisors (1).

680399 is an equidigital number, since it uses as much as digits as its factorization.

680399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 680399 is about 824.8630189310. The cubic root of 680399 is about 87.9537894434.

The spelling of 680399 in words is "six hundred eighty thousand, three hundred ninety-nine".