855709 has 2 divisors, whose sum is σ = 855710. Its totient is φ = 855708.

The previous prime is 855697. The next prime is 855713. The reversal of 855709 is 907558.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 850084 + 5625 = 922^2 + 75^2 .

It is a cyclic number.

It is not a de Polignac number, because 855709 - 2⁷ = 855581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427854 + 427855.

It is an arithmetic number, because the mean of its divisors is an integer number (427855).

2⁸⁵⁵⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

855709 is a deficient number, since it is larger than the sum of its proper divisors (1).

855709 is an equidigital number, since it uses as much as digits as its factorization.

855709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 855709 is about 925.0454042911. The cubic root of 855709 is about 94.9384273220.

The spelling of 855709 in words is "eight hundred fifty-five thousand, seven hundred nine".