9639621 has 16 divisors (see below), whose sum is σ = 14353920. Its totient is φ = 6393600.

The previous prime is 9639601. The next prime is 9639649. The reversal of 9639621 is 1269369.

It is not a de Polignac number, because 9639621 - 2⁵ = 9639589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9639601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5221 + ... + 6821.

It is an arithmetic number, because the mean of its divisors is an integer number (897120).

Almost surely, 2^9639621 is an apocalyptic number.

It is an amenable number.

9639621 is a deficient number, since it is larger than the sum of its proper divisors (4714299).

9639621 is a wasteful number, since it uses less digits than its factorization.

9639621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1833 (or 1827 counting only the distinct ones).

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

The square root of 9639621 is about 3104.7739048117. The cubic root of 9639621 is about 212.8236985898.

The spelling of 9639621 in words is "nine million, six hundred thirty-nine thousand, six hundred twenty-one".