938121838 has 8 divisors (see below), whose sum is σ = 1468364688. Its totient is φ = 448666944.

The previous prime is 938121799. The next prime is 938121839. The reversal of 938121838 is 838121839.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 938121794 and 938121803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (938121839) 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, 10196931 + ... + 10197022.

It is an arithmetic number, because the mean of its divisors is an integer number (183545586).

Almost surely, 2^938121838 is an apocalyptic number.

938121838 is a deficient number, since it is larger than the sum of its proper divisors (530242850).

938121838 is a wasteful number, since it uses less digits than its factorization.

938121838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20393978.

The product of its digits is 82944, while the sum is 43.

The square root of 938121838 is about 30628.7746734994. The cubic root of 938121838 is about 978.9332547739.

Subtracting from 938121838 its reverse (838121839), we obtain a palindrome (99999999).

The spelling of 938121838 in words is "nine hundred thirty-eight million, one hundred twenty-one thousand, eight hundred thirty-eight".