138218018 has 8 divisors (see below), whose sum is σ = 207377820. Its totient is φ = 69092080.

The previous prime is 138217993. The next prime is 138218021. The reversal of 138218018 is 810812831.

It is a happy number.

138218018 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 126405049 + 11812969 = 11243^2 + 3437^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8708 + ... + 18768.

Almost surely, 2^138218018 is an apocalyptic number.

138218018 is a deficient number, since it is larger than the sum of its proper divisors (69159802).

138218018 is a wasteful number, since it uses less digits than its factorization.

138218018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16932.

The product of its (nonzero) digits is 3072, while the sum is 32.

The square root of 138218018 is about 11756.6159246613. The cubic root of 138218018 is about 517.0369174515.

The spelling of 138218018 in words is "one hundred thirty-eight million, two hundred eighteen thousand, eighteen".