138343055 has 4 divisors (see below), whose sum is σ = 166011672. Its totient is φ = 110674440.

The previous prime is 138343039. The next prime is 138343057. The reversal of 138343055 is 550343831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 550343831 = 313 ⋅1758287.

It is not a de Polignac number, because 138343055 - 2⁴ = 138343039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138343057) 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, 13834301 + ... + 13834310.

It is an arithmetic number, because the mean of its divisors is an integer number (41502918).

Almost surely, 2^138343055 is an apocalyptic number.

138343055 is a deficient number, since it is larger than the sum of its proper divisors (27668617).

138343055 is an equidigital number, since it uses as much as digits as its factorization.

138343055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27668616.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 138343055 is about 11761.9324517700. The cubic root of 138343055 is about 517.1927805371.

Adding to 138343055 its reverse (550343831), we get a palindrome (688686886).

The spelling of 138343055 in words is "one hundred thirty-eight million, three hundred forty-three thousand, fifty-five".