9138889 has 8 divisors (see below), whose sum is σ = 9794880. Its totient is φ = 8504496.

The previous prime is 9138863. The next prime is 9138917. The reversal of 9138889 is 9888319.

9138889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9138889 - 2¹⁵ = 9106121 is a prime.

It is a Duffinian number.

9138889 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9138839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4519 + ... + 6220.

It is an arithmetic number, because the mean of its divisors is an integer number (1224360).

Almost surely, 2^9138889 is an apocalyptic number.

It is an amenable number.

9138889 is a deficient number, since it is larger than the sum of its proper divisors (655991).

9138889 is a wasteful number, since it uses less digits than its factorization.

9138889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10799.

The product of its digits is 124416, while the sum is 46.

The square root of 9138889 is about 3023.0595429134. The cubic root of 9138889 is about 209.0729277027.

The spelling of 9138889 in words is "nine million, one hundred thirty-eight thousand, eight hundred eighty-nine".