1984155823872 has 216 divisors, whose sum is σ = 6244942936960. Its totient is φ = 626575150080.

The previous prime is 1984155823807. The next prime is 1984155823879. The reversal of 1984155823872 is 2783285514891.

1984155823872 is a `hidden beast` number, since 1 + 9 + 8 + 4 + 1 + 558 + 2 + 3 + 8 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (216).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1984155823879) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 342597 + ... + 2021307.

Almost surely, 2^{1984155823872} is an apocalyptic number.

1984155823872 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 1984155823872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3122471468480).

1984155823872 is an abundant number, since it is smaller than the sum of its proper divisors (4260787113088).

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

1984155823872 is an equidigital number, since it uses as much as digits as its factorization.

1984155823872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1678761 (or 1678735 counting only the distinct ones).

The product of its digits is 38707200, while the sum is 63.

The spelling of 1984155823872 in words is "one trillion, nine hundred eighty-four billion, one hundred fifty-five million, eight hundred twenty-three thousand, eight hundred seventy-two".