686805793 has 2 divisors, whose sum is σ = 686805794. Its totient is φ = 686805792.

The previous prime is 686805781. The next prime is 686805809. The reversal of 686805793 is 397508686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 613651984 + 73153809 = 24772^2 + 8553^2 .

It is a cyclic number.

It is not a de Polignac number, because 686805793 - 2⁹ = 686805281 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 686805793.

It is not a weakly prime, because it can be changed into another prime (686805193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343402896 + 343402897.

It is an arithmetic number, because the mean of its divisors is an integer number (343402897).

Almost surely, 2^686805793 is an apocalyptic number.

It is an amenable number.

686805793 is a deficient number, since it is larger than the sum of its proper divisors (1).

686805793 is an equidigital number, since it uses as much as digits as its factorization.

686805793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The square root of 686805793 is about 26206.9798527034. The cubic root of 686805793 is about 882.2899180266.

The spelling of 686805793 in words is "six hundred eighty-six million, eight hundred five thousand, seven hundred ninety-three".