686773 has 2 divisors, whose sum is σ = 686774. Its totient is φ = 686772.

The previous prime is 686761. The next prime is 686789. The reversal of 686773 is 377686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 544644 + 142129 = 738^2 + 377^2 .

It is a cyclic number.

It is not a de Polignac number, because 686773 - 2¹³ = 678581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343386 + 343387.

It is an arithmetic number, because the mean of its divisors is an integer number (343387).

2⁶⁸⁶⁷⁷³ is an apocalyptic number.

It is an amenable number.

686773 is a deficient number, since it is larger than the sum of its proper divisors (1).

686773 is an equidigital number, since it uses as much as digits as its factorization.

686773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 37.

The square root of 686773 is about 828.7176841362. The cubic root of 686773 is about 88.2275875535.

The spelling of 686773 in words is "six hundred eighty-six thousand, seven hundred seventy-three".