9639889 has 4 divisors (see below), whose sum is σ = 11017024. Its totient is φ = 8262756.

The previous prime is 9639887. The next prime is 9639899. The reversal of 9639889 is 9889369.

9639889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 9889369 = 7 ⋅1412767.

It is a cyclic number.

It is not a de Polignac number, because 9639889 - 2¹ = 9639887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9639881) 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, 688557 + ... + 688570.

It is an arithmetic number, because the mean of its divisors is an integer number (2754256).

Almost surely, 2^9639889 is an apocalyptic number.

It is an amenable number.

9639889 is a deficient number, since it is larger than the sum of its proper divisors (1377135).

9639889 is a wasteful number, since it uses less digits than its factorization.

9639889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377134.

The product of its digits is 839808, while the sum is 52.

The square root of 9639889 is about 3104.8170638542. The cubic root of 9639889 is about 212.8256708742.

The spelling of 9639889 in words is "nine million, six hundred thirty-nine thousand, eight hundred eighty-nine".