138783218 has 32 divisors (see below), whose sum is σ = 248417280. Its totient is φ = 56897280.

The previous prime is 138783157. The next prime is 138783247. The reversal of 138783218 is 812387831.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36830 + ... + 40422.

It is an arithmetic number, because the mean of its divisors is an integer number (7763040).

Almost surely, 2^138783218 is an apocalyptic number.

138783218 is a deficient number, since it is larger than the sum of its proper divisors (109634062).

138783218 is a wasteful number, since it uses less digits than its factorization.

138783218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3722.

The product of its digits is 64512, while the sum is 41.

The square root of 138783218 is about 11780.6289305792. The cubic root of 138783218 is about 517.7407133947.

The spelling of 138783218 in words is "one hundred thirty-eight million, seven hundred eighty-three thousand, two hundred eighteen".