138438155 has 8 divisors (see below), whose sum is σ = 166914384. Its totient is φ = 110224800.

The previous prime is 138438151. The next prime is 138438169. The reversal of 138438155 is 551834831.

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

It is not a de Polignac number, because 138438155 - 2² = 138438151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138438151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64556 + ... + 66665.

It is an arithmetic number, because the mean of its divisors is an integer number (20864298).

Almost surely, 2^138438155 is an apocalyptic number.

138438155 is a deficient number, since it is larger than the sum of its proper divisors (28476229).

138438155 is a wasteful number, since it uses less digits than its factorization.

138438155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131437.

The product of its digits is 57600, while the sum is 38.

The square root of 138438155 is about 11765.9744602816. The cubic root of 138438155 is about 517.3112632164.

The spelling of 138438155 in words is "one hundred thirty-eight million, four hundred thirty-eight thousand, one hundred fifty-five".