686723 has 2 divisors, whose sum is σ = 686724. Its totient is φ = 686722.

The previous prime is 686687. The next prime is 686729. The reversal of 686723 is 327686.

686723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 686723.

It is not a weakly prime, because it can be changed into another prime (686729) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343361 + 343362.

It is an arithmetic number, because the mean of its divisors is an integer number (343362).

2⁶⁸⁶⁷²³ is an apocalyptic number.

686723 is a deficient number, since it is larger than the sum of its proper divisors (1).

686723 is an equidigital number, since it uses as much as digits as its factorization.

686723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

The square root of 686723 is about 828.6875164982. The cubic root of 686723 is about 88.2254463868.

The spelling of 686723 in words is "six hundred eighty-six thousand, seven hundred twenty-three".