985709 has 2 divisors, whose sum is σ = 985710. Its totient is φ = 985708.

The previous prime is 985703. The next prime is 985723. The reversal of 985709 is 907589.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 828100 + 157609 = 910^2 + 397^2 .

It is an emirp because it is prime and its reverse (907589) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-985709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (985703) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492854 + 492855.

It is an arithmetic number, because the mean of its divisors is an integer number (492855).

2⁹⁸⁵⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

985709 is a deficient number, since it is larger than the sum of its proper divisors (1).

985709 is an equidigital number, since it uses as much as digits as its factorization.

985709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 985709 is about 992.8287868510. The cubic root of 985709 is about 99.5213458913.

The spelling of 985709 in words is "nine hundred eighty-five thousand, seven hundred nine".