9878938123 has 4 divisors (see below), whose sum is σ = 9879284800. Its totient is φ = 9878591448.

The previous prime is 9878938117. The next prime is 9878938141. The reversal of 9878938123 is 3218398789.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3218398789 = 14639 ⋅219851.

It is a cyclic number.

It is not a de Polignac number, because 9878938123 - 2³³ = 1289003531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9878938523) 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, 126348 + ... + 189001.

It is an arithmetic number, because the mean of its divisors is an integer number (2469821200).

Almost surely, 2^9878938123 is an apocalyptic number.

9878938123 is a deficient number, since it is larger than the sum of its proper divisors (346677).

9878938123 is a wasteful number, since it uses less digits than its factorization.

9878938123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346676.

The product of its digits is 5225472, while the sum is 58.

The square root of 9878938123 is about 99392.8474438679. The cubic root of 9878938123 is about 2145.7053715148.

The spelling of 9878938123 in words is "nine billion, eight hundred seventy-eight million, nine hundred thirty-eight thousand, one hundred twenty-three".