9820665 has 24 divisors (see below), whose sum is σ = 17114760. Its totient is φ = 5209344.

The previous prime is 9820661. The next prime is 9820687. The reversal of 9820665 is 5660289.

It can be written as a sum of positive squares in 4 ways, for example, as 2595321 + 7225344 = 1611^2 + 2688^2 .

It is not a de Polignac number, because 9820665 - 2² = 9820661 is a prime.

It is a super-2 number, since 2×9820665² = 192890922084450, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9820661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9829 + ... + 10781.

It is an arithmetic number, because the mean of its divisors is an integer number (713115).

Almost surely, 2^9820665 is an apocalyptic number.

It is an amenable number.

9820665 is a deficient number, since it is larger than the sum of its proper divisors (7294095).

9820665 is a wasteful number, since it uses less digits than its factorization.

9820665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1193 (or 1190 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 9820665 is about 3133.7940264159. The cubic root of 9820665 is about 214.1478074575.

The spelling of 9820665 in words is "nine million, eight hundred twenty thousand, six hundred sixty-five".