138318216 has 32 divisors (see below), whose sum is σ = 346358400. Its totient is φ = 46031040.

The previous prime is 138318199. The next prime is 138318221. The reversal of 138318216 is 612813831.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11505 + ... + 20223.

It is an arithmetic number, because the mean of its divisors is an integer number (10823700).

Almost surely, 2^138318216 is an apocalyptic number.

It is an amenable number.

138318216 is an abundant number, since it is smaller than the sum of its proper divisors (208040184).

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

138318216 is a wasteful number, since it uses less digits than its factorization.

138318216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9389 (or 9385 counting only the distinct ones).

The product of its digits is 6912, while the sum is 33.

The square root of 138318216 is about 11760.8764979486. The cubic root of 138318216 is about 517.1618253140.

The spelling of 138318216 in words is "one hundred thirty-eight million, three hundred eighteen thousand, two hundred sixteen".