138440771038442 has 8 divisors (see below), whose sum is σ = 207701502630336. Its totient is φ = 69206936828332.

The previous prime is 138440771038441. The next prime is 138440771038457. The reversal of 138440771038442 is 244830177044831.

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

It is not an unprimeable number, because it can be changed into a prime (138440771038441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6724332578 + ... + 6724353165.

It is an arithmetic number, because the mean of its divisors is an integer number (25962687828792).

Almost surely, 2^{138440771038442} is an apocalyptic number.

138440771038442 is a deficient number, since it is larger than the sum of its proper divisors (69260731591894).

138440771038442 is a wasteful number, since it uses less digits than its factorization.

138440771038442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13448690892.

The product of its (nonzero) digits is 14450688, while the sum is 56.

The spelling of 138440771038442 in words is "one hundred thirty-eight trillion, four hundred forty billion, seven hundred seventy-one million, thirty-eight thousand, four hundred forty-two".