9909643 has 4 divisors (see below), whose sum is σ = 9921240. Its totient is φ = 9898048.

The previous prime is 9909629. The next prime is 9909649. The reversal of 9909643 is 3469099.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9909643 - 2⁵ = 9909611 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9909596 and 9909605.

It is not an unprimeable number, because it can be changed into a prime (9909649) 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, 4405 + ... + 6262.

It is an arithmetic number, because the mean of its divisors is an integer number (2480310).

Almost surely, 2^9909643 is an apocalyptic number.

9909643 is a deficient number, since it is larger than the sum of its proper divisors (11597).

9909643 is a wasteful number, since it uses less digits than its factorization.

9909643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11596.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 9909643 is about 3147.9585448350. The cubic root of 9909643 is about 214.7926105442.

The spelling of 9909643 in words is "nine million, nine hundred nine thousand, six hundred forty-three".