9639975 has 24 divisors (see below), whose sum is σ = 16149760. Its totient is φ = 5073120.

The previous prime is 9639947. The next prime is 9639979. The reversal of 9639975 is 5799369.

It is a happy number.

It is not a de Polignac number, because 9639975 - 2⁶ = 9639911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9639979) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5112 + ... + 6738.

Almost surely, 2^9639975 is an apocalyptic number.

9639975 is a deficient number, since it is larger than the sum of its proper divisors (6509785).

9639975 is a wasteful number, since it uses less digits than its factorization.

9639975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719 (or 1714 counting only the distinct ones).

The product of its digits is 459270, while the sum is 48.

The square root of 9639975 is about 3104.8309132705. The cubic root of 9639975 is about 212.8263037637.

Subtracting from 9639975 its reverse (5799369), we obtain a triangular number (3840606 = T₂₇₇₁).

The spelling of 9639975 in words is "nine million, six hundred thirty-nine thousand, nine hundred seventy-five".