18389487136 has 24 divisors (see below), whose sum is σ = 38109793680. Its totient is φ = 8710809408.

The previous prime is 18389487059. The next prime is 18389487161. The reversal of 18389487136 is 63178498381.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 15122326 + ... + 15123541.

It is an arithmetic number, because the mean of its divisors is an integer number (1587908070).

Almost surely, 2^18389487136 is an apocalyptic number.

18389487136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18389487136 is an abundant number, since it is smaller than the sum of its proper divisors (19720306544).

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

18389487136 is a wasteful number, since it uses less digits than its factorization.

18389487136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30245896 (or 30245888 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 58.

The spelling of 18389487136 in words is "eighteen billion, three hundred eighty-nine million, four hundred eighty-seven thousand, one hundred thirty-six".