138318784309 has 16 divisors (see below), whose sum is σ = 147034517760. Its totient is φ = 129668358400.

The previous prime is 138318784271. The next prime is 138318784319. The reversal of 138318784309 is 903487813831.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 138318784309 - 2⁹ = 138318783797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138318784309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138318784319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4899384 + ... + 4927534.

It is an arithmetic number, because the mean of its divisors is an integer number (9189657360).

Almost surely, 2^138318784309 is an apocalyptic number.

It is an amenable number.

138318784309 is a deficient number, since it is larger than the sum of its proper divisors (8715733451).

138318784309 is a wasteful number, since it uses less digits than its factorization.

138318784309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29300.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The spelling of 138318784309 in words is "one hundred thirty-eight billion, three hundred eighteen million, seven hundred eighty-four thousand, three hundred nine".