9938927381 has 4 divisors (see below), whose sum is σ = 9993838764. Its totient is φ = 9884016000.

The previous prime is 9938927287. The next prime is 9938927387. The reversal of 9938927381 is 1837298399.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 647702500 + 9291224881 = 25450^2 + 96391^2 .

It is a cyclic number.

It is not a de Polignac number, because 9938927381 - 2¹⁸ = 9938665237 is a prime.

It is a super-2 number, since 2×9938927381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9938927381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9938927387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27455420 + ... + 27455781.

It is an arithmetic number, because the mean of its divisors is an integer number (2498459691).

Almost surely, 2^9938927381 is an apocalyptic number.

It is an amenable number.

9938927381 is a deficient number, since it is larger than the sum of its proper divisors (54911383).

9938927381 is a wasteful number, since it uses less digits than its factorization.

9938927381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54911382.

The product of its digits is 5878656, while the sum is 59.

The square root of 9938927381 is about 99694.1692427396. The cubic root of 9938927381 is about 2150.0398320365.

The spelling of 9938927381 in words is "nine billion, nine hundred thirty-eight million, nine hundred twenty-seven thousand, three hundred eighty-one".