18239800320 has 880 divisors, whose sum is σ = 76660117248. Its totient is φ = 4060938240.

The previous prime is 18239800309. The next prime is 18239800321. The reversal of 18239800320 is 2300893281.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18239800321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 177085389 + ... + 177085491.

Almost surely, 2^18239800320 is an apocalyptic number.

18239800320 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 18239800320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38330058624).

18239800320 is an abundant number, since it is smaller than the sum of its proper divisors (58420316928).

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

18239800320 is a wasteful number, since it uses less digits than its factorization.

18239800320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 18239800320 in words is "eighteen billion, two hundred thirty-nine million, eight hundred thousand, three hundred twenty".