1838444997543 has 32 divisors (see below), whose sum is σ = 3084678236160. Its totient is φ = 946110776160.

The previous prime is 1838444997497. The next prime is 1838444997607. The reversal of 1838444997543 is 3457994448381.

It is not a de Polignac number, because 1838444997543 - 2⁶ = 1838444997479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1838444997043) 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 31 ways as a sum of consecutive naturals, for example, 37165173 + ... + 37214606.

It is an arithmetic number, because the mean of its divisors is an integer number (96396194880).

Almost surely, 2^{1838444997543} is an apocalyptic number.

1838444997543 is a deficient number, since it is larger than the sum of its proper divisors (1246233238617).

1838444997543 is a wasteful number, since it uses less digits than its factorization.

1838444997543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74379907.

The product of its digits is 418037760, while the sum is 69.

The spelling of 1838444997543 in words is "one trillion, eight hundred thirty-eight billion, four hundred forty-four million, nine hundred ninety-seven thousand, five hundred forty-three".