138144218 has 16 divisors (see below), whose sum is σ = 212372160. Its totient is φ = 67373856.

The previous prime is 138144217. The next prime is 138144229. The reversal of 138144218 is 812441831.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (138144217) 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, 8798 + ... + 18806.

It is an arithmetic number, because the mean of its divisors is an integer number (13273260).

Almost surely, 2^138144218 is an apocalyptic number.

138144218 is a deficient number, since it is larger than the sum of its proper divisors (74227942).

138144218 is a wasteful number, since it uses less digits than its factorization.

138144218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10181.

The product of its digits is 6144, while the sum is 32.

The square root of 138144218 is about 11753.4768472993. The cubic root of 138144218 is about 516.9448789983.

The spelling of 138144218 in words is "one hundred thirty-eight million, one hundred forty-four thousand, two hundred eighteen".