18984340872 has 192 divisors, whose sum is σ = 62186817600. Its totient is φ = 5349576960.

The previous prime is 18984340853. The next prime is 18984340891. The reversal of 18984340872 is 27804348981.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18984340853) and next prime (18984340891).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 760347 + ... + 784917.

It is an arithmetic number, because the mean of its divisors is an integer number (323889675).

Almost surely, 2^18984340872 is an apocalyptic number.

18984340872 is a gapful number since it is divisible by the number (12) 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 18984340872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31093408800).

18984340872 is an abundant number, since it is smaller than the sum of its proper divisors (43202476728).

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

18984340872 is a wasteful number, since it uses less digits than its factorization.

18984340872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24673 (or 24656 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The spelling of 18984340872 in words is "eighteen billion, nine hundred eighty-four million, three hundred forty thousand, eight hundred seventy-two".