18943534788 has 24 divisors (see below), whose sum is σ = 44237935392. Its totient is φ = 6309318144.

The previous prime is 18943534769. The next prime is 18943534789. The reversal of 18943534788 is 88743534981.

It is not an unprimeable number, because it can be changed into a prime (18943534789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 633970 + ... + 663177.

It is an arithmetic number, because the mean of its divisors is an integer number (1843247308).

Almost surely, 2^18943534788 is an apocalyptic number.

It is an amenable number.

18943534788 is an abundant number, since it is smaller than the sum of its proper divisors (25294400604).

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

18943534788 is a wasteful number, since it uses less digits than its factorization.

18943534788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298371 (or 1298369 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 60.

The spelling of 18943534788 in words is "eighteen billion, nine hundred forty-three million, five hundred thirty-four thousand, seven hundred eighty-eight".