9938 has 4 divisors (see below), whose sum is σ = 14910. Its totient is φ = 4968.

The previous prime is 9931. The next prime is 9941. The reversal of 9938 is 8399.

9938 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 an emirpimes, since its reverse is a distinct semiprime: 8399 = 37 ⋅227.

It can be written as a sum of positive squares in only one way, i.e., 9409 + 529 = 97^2 + 23^2 .

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 9938.

It is not an unprimeable number, because it can be changed into a prime (9931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2483 + ... + 2486.

2⁹⁹³⁸ is an apocalyptic number.

9938 is a deficient number, since it is larger than the sum of its proper divisors (4972).

9938 is a wasteful number, since it uses less digits than its factorization.

9938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4971.

The product of its digits is 1944, while the sum is 29.

The square root of 9938 is about 99.6895180047. The cubic root of 9938 is about 21.4997295802.

It can be divided in two parts, 993 and 8, that added together give a palindrome (1001).

The spelling of 9938 in words is "nine thousand, nine hundred thirty-eight".