9639825 has 24 divisors (see below), whose sum is σ = 17165568. Its totient is φ = 4745280.

The previous prime is 9639811. The next prime is 9639827. The reversal of 9639825 is 5289369.

It is not a de Polignac number, because 9639825 - 2⁶ = 9639761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9639827) 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 23 ways as a sum of consecutive naturals, for example, 3969 + ... + 5918.

It is an arithmetic number, because the mean of its divisors is an integer number (715232).

Almost surely, 2^9639825 is an apocalyptic number.

It is an amenable number.

9639825 is a deficient number, since it is larger than the sum of its proper divisors (7525743).

9639825 is a wasteful number, since it uses less digits than its factorization.

9639825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9913 (or 9908 counting only the distinct ones).

The product of its digits is 116640, while the sum is 42.

The square root of 9639825 is about 3104.8067572717. The cubic root of 9639825 is about 212.8251998842.

The spelling of 9639825 in words is "nine million, six hundred thirty-nine thousand, eight hundred twenty-five".