138540518 has 4 divisors (see below), whose sum is σ = 207810780. Its totient is φ = 69270258.

The previous prime is 138540503. The next prime is 138540527. The reversal of 138540518 is 815045831.

138540518 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34635128 + ... + 34635131.

It is an arithmetic number, because the mean of its divisors is an integer number (51952695).

Almost surely, 2^138540518 is an apocalyptic number.

138540518 is a deficient number, since it is larger than the sum of its proper divisors (69270262).

138540518 is an equidigital number, since it uses as much as digits as its factorization.

138540518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69270261.

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 138540518 is about 11770.3236149224. The cubic root of 138540518 is about 517.4387340635.

The spelling of 138540518 in words is "one hundred thirty-eight million, five hundred forty thousand, five hundred eighteen".