18040320000 has 780 divisors, whose sum is σ = 69857107320. Its totient is φ = 4644864000.

The previous prime is 18040319989. The next prime is 18040320019. The reversal of 18040320000 is 2304081.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

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 59 ways as a sum of consecutive naturals, for example, 622079986 + ... + 622080014.

It is an arithmetic number, because the mean of its divisors is an integer number (89560394).

Almost surely, 2^18040320000 is an apocalyptic number.

18040320000 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 18040320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34928553660).

18040320000 is an abundant number, since it is smaller than the sum of its proper divisors (51816787320).

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

18040320000 is an frugal number, since it uses more digits than its factorization.

18040320000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 39 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 18040320000 its reverse (2304081), we get a palindrome (18042624081).

The spelling of 18040320000 in words is "eighteen billion, forty million, three hundred twenty thousand".