18340781740 has 48 divisors (see below), whose sum is σ = 39512569824. Its totient is φ = 7146944000.

The previous prime is 18340781731. The next prime is 18340781741. The reversal of 18340781740 is 4718704381.

It is not an unprimeable number, because it can be changed into a prime (18340781741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 558867 + ... + 590773.

It is an arithmetic number, because the mean of its divisors is an integer number (823178538).

Almost surely, 2^18340781740 is an apocalyptic number.

18340781740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18340781740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19756284912).

18340781740 is an abundant number, since it is smaller than the sum of its proper divisors (21171788084).

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

18340781740 is a wasteful number, since it uses less digits than its factorization.

18340781740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32658 (or 32656 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 43.

The spelling of 18340781740 in words is "eighteen billion, three hundred forty million, seven hundred eighty-one thousand, seven hundred forty".