9638889 has 24 divisors (see below), whose sum is σ = 14277312. Its totient is φ = 5748960.

The previous prime is 9638857. The next prime is 9638891. The reversal of 9638889 is 9888369.

9638889 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9638889 - 2⁵ = 9638857 is a prime.

9638889 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9638809) 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, 135724 + ... + 135794.

It is an arithmetic number, because the mean of its divisors is an integer number (594888).

Almost surely, 2^9638889 is an apocalyptic number.

It is an amenable number.

9638889 is a deficient number, since it is larger than the sum of its proper divisors (4638423).

9638889 is a wasteful number, since it uses less digits than its factorization.

9638889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205 (or 146 counting only the distinct ones).

The product of its digits is 746496, while the sum is 51.

The square root of 9638889 is about 3104.6560195938. The cubic root of 9638889 is about 212.8183114177.

The spelling of 9638889 in words is "nine million, six hundred thirty-eight thousand, eight hundred eighty-nine".