138015123 has 8 divisors (see below), whose sum is σ = 187037136. Its totient is φ = 90501600.

The previous prime is 138015113. The next prime is 138015173. The reversal of 138015123 is 321510831.

138015123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 138015123 - 2¹⁶ = 137949587 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138015093 and 138015102.

It is not an unprimeable number, because it can be changed into a prime (138015103) 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, 376908 + ... + 377273.

It is an arithmetic number, because the mean of its divisors is an integer number (23379642).

Almost surely, 2^138015123 is an apocalyptic number.

138015123 is a deficient number, since it is larger than the sum of its proper divisors (49022013).

138015123 is an equidigital number, since it uses as much as digits as its factorization.

138015123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754245.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 138015123 is about 11747.9837844628. The cubic root of 138015123 is about 516.7838014453.

Adding to 138015123 its reverse (321510831), we get a palindrome (459525954).

The spelling of 138015123 in words is "one hundred thirty-eight million, fifteen thousand, one hundred twenty-three".