9917889 has 4 divisors (see below), whose sum is σ = 13223856. Its totient is φ = 6611924.

The previous prime is 9917881. The next prime is 9917891. The reversal of 9917889 is 9887199.

9917889 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.

It is a cyclic number.

It is not a de Polignac number, because 9917889 - 2³ = 9917881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9917881) 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, 1652979 + ... + 1652984.

It is an arithmetic number, because the mean of its divisors is an integer number (3305964).

Almost surely, 2^9917889 is an apocalyptic number.

It is an amenable number.

9917889 is a deficient number, since it is larger than the sum of its proper divisors (3305967).

9917889 is a wasteful number, since it uses less digits than its factorization.

9917889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3305966.

The product of its digits is 326592, while the sum is 51.

The square root of 9917889 is about 3149.2680101890. The cubic root of 9917889 is about 214.8521716813.

The spelling of 9917889 in words is "nine million, nine hundred seventeen thousand, eight hundred eighty-nine".