138108538 has 8 divisors (see below), whose sum is σ = 209099232. Its totient is φ = 68408796.

The previous prime is 138108521. The next prime is 138108613. The reversal of 138108538 is 835801831.

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 = 138108497 and 138108506.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322470 + ... + 322897.

It is an arithmetic number, because the mean of its divisors is an integer number (26137404).

Almost surely, 2^138108538 is an apocalyptic number.

138108538 is a deficient number, since it is larger than the sum of its proper divisors (70990694).

138108538 is a wasteful number, since it uses less digits than its factorization.

138108538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645476.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 138108538 is about 11751.9589005408. The cubic root of 138108538 is about 516.9003695194.

The spelling of 138108538 in words is "one hundred thirty-eight million, one hundred eight thousand, five hundred thirty-eight".