9938378111 has 4 divisors (see below), whose sum is σ = 9940961352. Its totient is φ = 9935794872.

The previous prime is 9938378101. The next prime is 9938378113. The reversal of 9938378111 is 1118738399.

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

It is a cyclic number.

It is not a de Polignac number, because 9938378111 - 2¹⁰ = 9938377087 is a prime.

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 9938378111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9938378113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1285841 + ... + 1293546.

It is an arithmetic number, because the mean of its divisors is an integer number (2485240338).

Almost surely, 2^9938378111 is an apocalyptic number.

9938378111 is a deficient number, since it is larger than the sum of its proper divisors (2583241).

9938378111 is a wasteful number, since it uses less digits than its factorization.

9938378111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2583240.

The product of its digits is 326592, while the sum is 50.

The square root of 9938378111 is about 99691.4144297291. The cubic root of 9938378111 is about 2150.0002243375. Note that the first 3 decimals are identical.

The spelling of 9938378111 in words is "nine billion, nine hundred thirty-eight million, three hundred seventy-eight thousand, one hundred eleven".