9938817993 has 16 divisors (see below), whose sum is σ = 14272958336. Its totient is φ = 6115409280.

The previous prime is 9938817949. The next prime is 9938817997. The reversal of 9938817993 is 3997188399.

It is not a de Polignac number, because 9938817993 - 2¹² = 9938813897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9938817997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 485148 + ... + 505218.

It is an arithmetic number, because the mean of its divisors is an integer number (892059896).

Almost surely, 2^9938817993 is an apocalyptic number.

It is an amenable number.

9938817993 is a deficient number, since it is larger than the sum of its proper divisors (4334140343).

9938817993 is a wasteful number, since it uses less digits than its factorization.

9938817993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32784.

The product of its digits is 26453952, while the sum is 66.

The square root of 9938817993 is about 99693.6206233879. The cubic root of 9938817993 is about 2150.0319442162.

The spelling of 9938817993 in words is "nine billion, nine hundred thirty-eight million, eight hundred seventeen thousand, nine hundred ninety-three".