138710155 has 4 divisors (see below), whose sum is σ = 166452192. Its totient is φ = 110968120.

The previous prime is 138710153. The next prime is 138710179. The reversal of 138710155 is 551017831.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 138710155 - 2¹ = 138710153 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138710153) 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, 13871011 + ... + 13871020.

It is an arithmetic number, because the mean of its divisors is an integer number (41613048).

Almost surely, 2^138710155 is an apocalyptic number.

138710155 is a deficient number, since it is larger than the sum of its proper divisors (27742037).

138710155 is an equidigital number, since it uses as much as digits as its factorization.

138710155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27742036.

The product of its (nonzero) digits is 4200, while the sum is 31.

The square root of 138710155 is about 11777.5275418910. The cubic root of 138710155 is about 517.6498418652.

Adding to 138710155 its reverse (551017831), we get a palindrome (689727986).

The spelling of 138710155 in words is "one hundred thirty-eight million, seven hundred ten thousand, one hundred fifty-five".