18508843440 has 360 divisors, whose sum is σ = 65236382640. Its totient is φ = 4883203584.

The previous prime is 18508843421. The next prime is 18508843447. The reversal of 18508843440 is 4434880581.

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (18508843447) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 93953422 + ... + 93953618.

It is an arithmetic number, because the mean of its divisors is an integer number (181212174).

Almost surely, 2^18508843440 is an apocalyptic number.

18508843440 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 18508843440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32618191320).

18508843440 is an abundant number, since it is smaller than the sum of its proper divisors (46727539200).

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

18508843440 is an equidigital number, since it uses as much as digits as its factorization.

18508843440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 45.

The spelling of 18508843440 in words is "eighteen billion, five hundred eight million, eight hundred forty-three thousand, four hundred forty".