1999983821652 has 240 divisors, whose sum is σ = 5593283554320. Its totient is φ = 620956274688.

The previous prime is 1999983821639. The next prime is 1999983821723. The reversal of 1999983821652 is 2561283899991.

1999983821652 is a `hidden beast` number, since 19 + 99 + 98 + 382 + 1 + 65 + 2 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 219664691856 + 1780319129796 = 468684^2 + 1334286^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 742658818 + ... + 742661510.

It is an arithmetic number, because the mean of its divisors is an integer number (23305348143).

Almost surely, 2^{1999983821652} is an apocalyptic number.

1999983821652 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 1999983821652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2796641777160).

1999983821652 is an abundant number, since it is smaller than the sum of its proper divisors (3593299732668).

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

1999983821652 is a wasteful number, since it uses less digits than its factorization.

1999983821652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4072 (or 4061 counting only the distinct ones).

The product of its digits is 151165440, while the sum is 72.

The spelling of 1999983821652 in words is "one trillion, nine hundred ninety-nine billion, nine hundred eighty-three million, eight hundred twenty-one thousand, six hundred fifty-two".