138926171 has 4 divisors (see below), whose sum is σ = 139057200. Its totient is φ = 138795144.

The previous prime is 138926167. The next prime is 138926237. The reversal of 138926171 is 171629831.

138926171 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: 171629831 = 19 ⋅9033149.

It is a cyclic number.

It is not a de Polignac number, because 138926171 - 2² = 138926167 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138926111) 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, 63911 + ... + 66048.

It is an arithmetic number, because the mean of its divisors is an integer number (34764300).

Almost surely, 2^138926171 is an apocalyptic number.

138926171 is a deficient number, since it is larger than the sum of its proper divisors (131029).

138926171 is a wasteful number, since it uses less digits than its factorization.

138926171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131028.

The product of its digits is 18144, while the sum is 38.

The square root of 138926171 is about 11786.6946596576. The cubic root of 138926171 is about 517.9184178551.

The spelling of 138926171 in words is "one hundred thirty-eight million, nine hundred twenty-six thousand, one hundred seventy-one".