1838879781413 has 2 divisors, whose sum is σ = 1838879781414. Its totient is φ = 1838879781412.

The previous prime is 1838879781379. The next prime is 1838879781443. The reversal of 1838879781413 is 3141879788381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1776907662049 + 61972119364 = 1333007^2 + 248942^2 .

It is an emirp because it is prime and its reverse (3141879788381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1838879781413 - 2²⁴ = 1838863004197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1838879781443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 919439890706 + 919439890707.

It is an arithmetic number, because the mean of its divisors is an integer number (919439890707).

Almost surely, 2^{1838879781413} is an apocalyptic number.

It is an amenable number.

1838879781413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1838879781413 is an equidigital number, since it uses as much as digits as its factorization.

1838879781413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 65028096, while the sum is 68.

The spelling of 1838879781413 in words is "one trillion, eight hundred thirty-eight billion, eight hundred seventy-nine million, seven hundred eighty-one thousand, four hundred thirteen".