9909645 has 8 divisors (see below), whose sum is σ = 15855456. Its totient is φ = 5285136.

The previous prime is 9909629. The next prime is 9909649. The reversal of 9909645 is 5469099.

It is a happy number.

9909645 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9909645 - 2⁴ = 9909629 is a prime.

It is a super-3 number, since 3×9909645³ (a number of 22 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9909597 and 9909606.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 330307 + ... + 330336.

It is an arithmetic number, because the mean of its divisors is an integer number (1981932).

Almost surely, 2^9909645 is an apocalyptic number.

It is an amenable number.

9909645 is a deficient number, since it is larger than the sum of its proper divisors (5945811).

9909645 is a wasteful number, since it uses less digits than its factorization.

9909645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660651.

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 9909645 is about 3147.9588625012. The cubic root of 9909645 is about 214.7926249943.

The spelling of 9909645 in words is "nine million, nine hundred nine thousand, six hundred forty-five".