9816985 has 4 divisors (see below), whose sum is σ = 11780388. Its totient is φ = 7853584.

The previous prime is 9816971. The next prime is 9816997. The reversal of 9816985 is 5896189.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5896189 = 13 ⋅453553.

It can be written as a sum of positive squares in 2 ways, for example, as 3426201 + 6390784 = 1851^2 + 2528^2 .

It is a cyclic number.

It is not a de Polignac number, because 9816985 - 2⁵ = 9816953 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 981694 + ... + 981703.

It is an arithmetic number, because the mean of its divisors is an integer number (2945097).

Almost surely, 2^9816985 is an apocalyptic number.

It is an amenable number.

9816985 is a deficient number, since it is larger than the sum of its proper divisors (1963403).

9816985 is a wasteful number, since it uses less digits than its factorization.

9816985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1963402.

The product of its digits is 155520, while the sum is 46.

The square root of 9816985 is about 3133.2068236872. The cubic root of 9816985 is about 214.1210556239.

It can be divided in two parts, 9816 and 985, that added together give a palindrome (10801).

The spelling of 9816985 in words is "nine million, eight hundred sixteen thousand, nine hundred eighty-five".