680489 has 2 divisors, whose sum is σ = 680490. Its totient is φ = 680488.

The previous prime is 680453. The next prime is 680503. The reversal of 680489 is 984086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 462400 + 218089 = 680^2 + 467^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-680489 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (680189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340244 + 340245.

It is an arithmetic number, because the mean of its divisors is an integer number (340245).

2⁶⁸⁰⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

680489 is a deficient number, since it is larger than the sum of its proper divisors (1).

680489 is an equidigital number, since it uses as much as digits as its factorization.

680489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 680489 is about 824.9175716397. The cubic root of 680489 is about 87.9576673112.

It can be divided in two parts, 680 and 489, that multiplied together give a triangular number (332520 = T₈₁₅).

The spelling of 680489 in words is "six hundred eighty thousand, four hundred eighty-nine".