19998343872 has 84 divisors (see below), whose sum is σ = 61731022080. Its totient is φ = 6153334272.

The previous prime is 19998343843. The next prime is 19998343889. The reversal of 19998343872 is 27834389991.

19998343872 is a `hidden beast` number, since 199 + 9 + 8 + 3 + 438 + 7 + 2 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1327872 + ... + 1342847.

It is an arithmetic number, because the mean of its divisors is an integer number (734893120).

Almost surely, 2^19998343872 is an apocalyptic number.

19998343872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19998343872 is an abundant number, since it is smaller than the sum of its proper divisors (41732678208).

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

19998343872 is a wasteful number, since it uses less digits than its factorization.

19998343872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2670750 (or 2670737 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 63.

The spelling of 19998343872 in words is "nineteen billion, nine hundred ninety-eight million, three hundred forty-three thousand, eight hundred seventy-two".