680391 has 12 divisors (see below), whose sum is σ = 1040832. Its totient is φ = 426816.

The previous prime is 680387. The next prime is 680399. The reversal of 680391 is 193086.

680391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 680391 - 2² = 680387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680399) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2071 + ... + 2376.

It is an arithmetic number, because the mean of its divisors is an integer number (86736).

2⁶⁸⁰³⁹¹ is an apocalyptic number.

680391 is a deficient number, since it is larger than the sum of its proper divisors (360441).

680391 is a wasteful number, since it uses less digits than its factorization.

680391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4470 (or 4467 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 680391 is about 824.8581696268. The cubic root of 680391 is about 87.9534447275.

The spelling of 680391 in words is "six hundred eighty thousand, three hundred ninety-one".