1838879781438 has 16 divisors (see below), whose sum is σ = 4203153786240. Its totient is φ = 525394223256.

The previous prime is 1838879781413. The next prime is 1838879781443. The reversal of 1838879781438 is 8341879788381.

It is a self number, because there is not a number n which added to its sum of digits gives 1838879781438.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21891425928 + ... + 21891426011.

It is an arithmetic number, because the mean of its divisors is an integer number (262697111640).

Almost surely, 2^{1838879781438} is an apocalyptic number.

1838879781438 is an abundant number, since it is smaller than the sum of its proper divisors (2364274004802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1838879781438 is a wasteful number, since it uses less digits than its factorization.

1838879781438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43782851951.

The product of its digits is 520224768, while the sum is 75.

The spelling of 1838879781438 in words is "one trillion, eight hundred thirty-eight billion, eight hundred seventy-nine million, seven hundred eighty-one thousand, four hundred thirty-eight".