18389805824 has 72 divisors (see below), whose sum is σ = 39737665632. Its totient is φ = 8443330560.

The previous prime is 18389805817. The next prime is 18389805827. The reversal of 18389805824 is 42850898381.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18389805824.

It is not an unprimeable number, because it can be changed into a prime (18389805827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 627989 + ... + 656619.

Almost surely, 2^18389805824 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18389805824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19868832816).

18389805824 is an abundant number, since it is smaller than the sum of its proper divisors (21347859808).

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

18389805824 is a wasteful number, since it uses less digits than its factorization.

18389805824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28853 (or 28839 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 56.

The spelling of 18389805824 in words is "eighteen billion, three hundred eighty-nine million, eight hundred five thousand, eight hundred twenty-four".