1338120918381 has 16 divisors (see below), whose sum is σ = 1940058813056. Its totient is φ = 815464276416.

The previous prime is 1338120918371. The next prime is 1338120918389. The reversal of 1338120918381 is 1838190218331.

It is not a de Polignac number, because 1338120918381 - 2¹⁷ = 1338120787309 is a prime.

It is a super-2 number, since 2×1338120918381² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1338120918381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1338120918389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166553230 + ... + 166561263.

It is an arithmetic number, because the mean of its divisors is an integer number (121253675816).

Almost surely, 2^{1338120918381} is an apocalyptic number.

It is an amenable number.

1338120918381 is a deficient number, since it is larger than the sum of its proper divisors (601937894675).

1338120918381 is a wasteful number, since it uses less digits than its factorization.

1338120918381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333114612.

The product of its (nonzero) digits is 248832, while the sum is 48.

The spelling of 1338120918381 in words is "one trillion, three hundred thirty-eight billion, one hundred twenty million, nine hundred eighteen thousand, three hundred eighty-one".