685973 has 2 divisors, whose sum is σ = 685974. Its totient is φ = 685972.

The previous prime is 685969. The next prime is 685987. The reversal of 685973 is 379586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 432964 + 253009 = 658^2 + 503^2 .

It is a cyclic number.

It is not a de Polignac number, because 685973 - 2² = 685969 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342986 + 342987.

It is an arithmetic number, because the mean of its divisors is an integer number (342987).

2⁶⁸⁵⁹⁷³ is an apocalyptic number.

It is an amenable number.

685973 is a deficient number, since it is larger than the sum of its proper divisors (1).

685973 is an equidigital number, since it uses as much as digits as its factorization.

685973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 685973 is about 828.2348700701. The cubic root of 685973 is about 88.1933164071.

The spelling of 685973 in words is "six hundred eighty-five thousand, nine hundred seventy-three".