680865439 has 2 divisors, whose sum is σ = 680865440. Its totient is φ = 680865438.

The previous prime is 680865421. The next prime is 680865473. The reversal of 680865439 is 934568086.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 680865439 - 2⁹ = 680864927 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 680865392 and 680865401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680865239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340432719 + 340432720.

It is an arithmetic number, because the mean of its divisors is an integer number (340432720).

Almost surely, 2^680865439 is an apocalyptic number.

680865439 is a deficient number, since it is larger than the sum of its proper divisors (1).

680865439 is an equidigital number, since it uses as much as digits as its factorization.

680865439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The square root of 680865439 is about 26093.3983796668. The cubic root of 680865439 is about 879.7388339142.

The spelling of 680865439 in words is "six hundred eighty million, eight hundred sixty-five thousand, four hundred thirty-nine".