18389470538 has 16 divisors (see below), whose sum is σ = 27930147840. Its totient is φ = 9079529376.

The previous prime is 18389470513. The next prime is 18389470543. The reversal of 18389470538 is 83507498381.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328823 + ... + 380661.

It is an arithmetic number, because the mean of its divisors is an integer number (1745634240).

Almost surely, 2^18389470538 is an apocalyptic number.

18389470538 is a deficient number, since it is larger than the sum of its proper divisors (9540677302).

18389470538 is a wasteful number, since it uses less digits than its factorization.

18389470538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54061.

The product of its (nonzero) digits is 5806080, while the sum is 56.

The spelling of 18389470538 in words is "eighteen billion, three hundred eighty-nine million, four hundred seventy thousand, five hundred thirty-eight".