18889957484 has 12 divisors (see below), whose sum is σ = 33060137208. Its totient is φ = 9444204000.

The previous prime is 18889957459. The next prime is 18889957487. The reversal of 18889957484 is 48475998881.

It is a super-2 number, since 2×18889957484² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18889957487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136982 + ... + 237789.

It is an arithmetic number, because the mean of its divisors is an integer number (2755011434).

Almost surely, 2^18889957484 is an apocalyptic number.

It is an amenable number.

18889957484 is a deficient number, since it is larger than the sum of its proper divisors (14170179724).

18889957484 is a wasteful number, since it uses less digits than its factorization.

18889957484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387376 (or 387374 counting only the distinct ones).

The product of its digits is 185794560, while the sum is 71.

The spelling of 18889957484 in words is "eighteen billion, eight hundred eighty-nine million, nine hundred fifty-seven thousand, four hundred eighty-four".