9996638 has 4 divisors (see below), whose sum is σ = 14994960. Its totient is φ = 4998318.

The previous prime is 9996631. The next prime is 9996647. The reversal of 9996638 is 8366999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8366999 = 103 ⋅81233.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9996631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2499158 + ... + 2499161.

It is an arithmetic number, because the mean of its divisors is an integer number (3748740).

Almost surely, 2^9996638 is an apocalyptic number.

9996638 is a deficient number, since it is larger than the sum of its proper divisors (4998322).

9996638 is a wasteful number, since it uses less digits than its factorization.

9996638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4998321.

The product of its digits is 629856, while the sum is 50.

The square root of 9996638 is about 3161.7460366070. The cubic root of 9996638 is about 215.4193222655.

The spelling of 9996638 in words is "nine million, nine hundred ninety-six thousand, six hundred thirty-eight".