1984543441920 has 1056 divisors, whose sum is σ = 7946308581120. Its totient is φ = 471546593280.

The previous prime is 1984543441883. The next prime is 1984543441927. The reversal of 1984543441920 is 291443454891.

1984543441920 is a `hidden beast` number, since 1 + 9 + 8 + 4 + 543 + 4 + 4 + 1 + 92 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (1984543441927) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 469046205 + ... + 469050435.

Almost surely, 2^{1984543441920} is an apocalyptic number.

1984543441920 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 1984543441920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3973154290560).

1984543441920 is an abundant number, since it is smaller than the sum of its proper divisors (5961765139200).

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

1984543441920 is a wasteful number, since it uses less digits than its factorization.

1984543441920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4313 (or 4283 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 54.

The spelling of 1984543441920 in words is "one trillion, nine hundred eighty-four billion, five hundred forty-three million, four hundred forty-one thousand, nine hundred twenty".