1998812836920 has 64 divisors (see below), whose sum is σ = 5996828344320. Its totient is φ = 532982104704.

The previous prime is 1998812836901. The next prime is 1998812836931. The reversal of 1998812836920 is 296382188991.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1339209 + ... + 2406471.

It is an arithmetic number, because the mean of its divisors is an integer number (93700442880).

Almost surely, 2^{1998812836920} is an apocalyptic number.

1998812836920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1998812836920 is an abundant number, since it is smaller than the sum of its proper divisors (3998015507400).

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

1998812836920 is a wasteful number, since it uses less digits than its factorization.

1998812836920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082884 (or 1082880 counting only the distinct ones).

The product of its (nonzero) digits is 26873856, while the sum is 66.

The spelling of 1998812836920 in words is "one trillion, nine hundred ninety-eight billion, eight hundred twelve million, eight hundred thirty-six thousand, nine hundred twenty".