9827681 has 4 divisors (see below), whose sum is σ = 10093332. Its totient is φ = 9562032.

The previous prime is 9827669. The next prime is 9827743. The reversal of 9827681 is 1867289.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1867289 = 293 ⋅6373.

It can be written as a sum of positive squares in 2 ways, for example, as 6677056 + 3150625 = 2584^2 + 1775^2 .

It is a cyclic number.

It is not a de Polignac number, because 9827681 - 2¹⁸ = 9565537 is a prime.

It is a super-2 number, since 2×9827681² = 193166627675522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9827281) by changing a digit.

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, 132770 + ... + 132843.

It is an arithmetic number, because the mean of its divisors is an integer number (2523333).

Almost surely, 2^9827681 is an apocalyptic number.

It is an amenable number.

9827681 is a deficient number, since it is larger than the sum of its proper divisors (265651).

9827681 is a wasteful number, since it uses less digits than its factorization.

9827681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265650.

The product of its digits is 48384, while the sum is 41.

The square root of 9827681 is about 3134.9132364389. The cubic root of 9827681 is about 214.1987918992.

The spelling of 9827681 in words is "nine million, eight hundred twenty-seven thousand, six hundred eighty-one".