9639989 has 4 divisors (see below), whose sum is σ = 9666624. Its totient is φ = 9613356.

The previous prime is 9639979. The next prime is 9639997. The reversal of 9639989 is 9899369.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9899369 = 1051 ⋅9419.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9639989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9639989.

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 3 ways as a sum of consecutive naturals, for example, 12767 + ... + 13500.

It is an arithmetic number, because the mean of its divisors is an integer number (2416656).

Almost surely, 2^9639989 is an apocalyptic number.

It is an amenable number.

9639989 is a deficient number, since it is larger than the sum of its proper divisors (26635).

9639989 is a wasteful number, since it uses less digits than its factorization.

9639989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26634.

The product of its digits is 944784, while the sum is 53.

The square root of 9639989 is about 3104.8331678208. The cubic root of 9639989 is about 212.8264067919.

The spelling of 9639989 in words is "nine million, six hundred thirty-nine thousand, nine hundred eighty-nine".