680405 has 16 divisors (see below), whose sum is σ = 907200. Its totient is φ = 485760.

The previous prime is 680401. The next prime is 680411. The reversal of 680405 is 504086.

680405 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 680405 - 2² = 680401 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4826 + ... + 4964.

It is an arithmetic number, because the mean of its divisors is an integer number (56700).

2⁶⁸⁰⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

680405 is a deficient number, since it is larger than the sum of its proper divisors (226795).

680405 is a wasteful number, since it uses less digits than its factorization.

680405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 680405 is about 824.8666558905. The cubic root of 680405 is about 87.9540479786.

The spelling of 680405 in words is "six hundred eighty thousand, four hundred five".