138538115 has 4 divisors (see below), whose sum is σ = 166245744. Its totient is φ = 110830488.

The previous prime is 138538109. The next prime is 138538123. The reversal of 138538115 is 511835831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 511835831 = 13 ⋅39371987.

It is a cyclic number.

It is not a de Polignac number, because 138538115 - 2⁶ = 138538051 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13853807 + ... + 13853816.

It is an arithmetic number, because the mean of its divisors is an integer number (41561436).

Almost surely, 2^138538115 is an apocalyptic number.

138538115 is a deficient number, since it is larger than the sum of its proper divisors (27707629).

138538115 is an equidigital number, since it uses as much as digits as its factorization.

138538115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27707628.

The product of its digits is 14400, while the sum is 35.

The square root of 138538115 is about 11770.2215357231. The cubic root of 138538115 is about 517.4357423696.

The spelling of 138538115 in words is "one hundred thirty-eight million, five hundred thirty-eight thousand, one hundred fifteen".