9923661 has 16 divisors (see below), whose sum is σ = 16038720. Its totient is φ = 6014160.

The previous prime is 9923647. The next prime is 9923671. The reversal of 9923661 is 1663299.

It is not a de Polignac number, because 9923661 - 2⁵ = 9923629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9923611) 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 15 ways as a sum of consecutive naturals, for example, 16410 + ... + 17003.

It is an arithmetic number, because the mean of its divisors is an integer number (1002420).

Almost surely, 2^9923661 is an apocalyptic number.

It is an amenable number.

9923661 is a deficient number, since it is larger than the sum of its proper divisors (6115059).

9923661 is a wasteful number, since it uses less digits than its factorization.

9923661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33433 (or 33427 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 9923661 is about 3150.1842803239. The cubic root of 9923661 is about 214.8938433932.

The spelling of 9923661 in words is "nine million, nine hundred twenty-three thousand, six hundred sixty-one".