18994476384 has 72 divisors (see below), whose sum is σ = 58170595392. Its totient is φ = 5844453120.

The previous prime is 18994476313. The next prime is 18994476401. The reversal of 18994476384 is 48367449981.

18994476384 is a `hidden beast` number, since 1 + 89 + 9 + 4 + 476 + 3 + 84 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2532912 + ... + 2540399.

It is an arithmetic number, because the mean of its divisors is an integer number (807924936).

Almost surely, 2^18994476384 is an apocalyptic number.

It is an amenable number.

18994476384 is an abundant number, since it is smaller than the sum of its proper divisors (39176119008).

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

18994476384 is a wasteful number, since it uses less digits than its factorization.

18994476384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5073340 (or 5073329 counting only the distinct ones).

The product of its digits is 41803776, while the sum is 63.

The spelling of 18994476384 in words is "eighteen billion, nine hundred ninety-four million, four hundred seventy-six thousand, three hundred eighty-four".