1998231727072 has 72 divisors (see below), whose sum is σ = 4640762775600. Its totient is φ = 844323217920.

The previous prime is 1998231727069. The next prime is 1998231727109. The reversal of 1998231727072 is 2707271328991.

It is a junction number, because it is equal to n+sod(n) for n = 1998231726998 and 1998231727016.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8863197 + ... + 9085852.

It is an arithmetic number, because the mean of its divisors is an integer number (64455038550).

Almost surely, 2^{1998231727072} is an apocalyptic number.

It is an amenable number.

1998231727072 is an abundant number, since it is smaller than the sum of its proper divisors (2642531048528).

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

1998231727072 is a wasteful number, since it uses less digits than its factorization.

1998231727072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17949144 (or 17949129 counting only the distinct ones).

The product of its (nonzero) digits is 5334336, while the sum is 58.

The spelling of 1998231727072 in words is "one trillion, nine hundred ninety-eight billion, two hundred thirty-one million, seven hundred twenty-seven thousand, seventy-two".