138540018 has 32 divisors (see below), whose sum is σ = 287294400. Its totient is φ = 44485056.

The previous prime is 138539977. The next prime is 138540041. The reversal of 138540018 is 810045831.

138540018 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122805 + ... + 123927.

It is an arithmetic number, because the mean of its divisors is an integer number (8977950).

Almost surely, 2^138540018 is an apocalyptic number.

138540018 is an abundant number, since it is smaller than the sum of its proper divisors (148754382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138540018 is a wasteful number, since it uses less digits than its factorization.

138540018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1866.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 138540018 is about 11770.3023750454. The cubic root of 138540018 is about 517.4381115749.

Adding to 138540018 its reverse (810045831), we get a palindrome (948585849).

The spelling of 138540018 in words is "one hundred thirty-eight million, five hundred forty thousand, eighteen".