985997 has 2 divisors, whose sum is σ = 985998. Its totient is φ = 985996.

The previous prime is 985993. The next prime is 986023. The reversal of 985997 is 799589.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 958441 + 27556 = 979^2 + 166^2 .

It is a cyclic number.

It is not a de Polignac number, because 985997 - 2² = 985993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (985991) 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, 492998 + 492999.

It is an arithmetic number, because the mean of its divisors is an integer number (492999).

2⁹⁸⁵⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

985997 is a deficient number, since it is larger than the sum of its proper divisors (1).

985997 is an equidigital number, since it uses as much as digits as its factorization.

985997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 47.

The square root of 985997 is about 992.9738163718. The cubic root of 985997 is about 99.5310375131.

The spelling of 985997 in words is "nine hundred eighty-five thousand, nine hundred ninety-seven".