1998931648 has 28 divisors (see below), whose sum is σ = 4533292432. Its totient is φ = 856684800.

The previous prime is 1998931639. The next prime is 1998931721. The reversal of 1998931648 is 8461398991.

It is a tau number, because it is divible by the number of its divisors (28).

It is a junction number, because it is equal to n+sod(n) for n = 1998931592 and 1998931601.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2230503 + ... + 2231398.

Almost surely, 2^1998931648 is an apocalyptic number.

It is an amenable number.

1998931648 is an abundant number, since it is smaller than the sum of its proper divisors (2534360784).

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

1998931648 is an equidigital number, since it uses as much as digits as its factorization.

1998931648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4461920 (or 4461910 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 58.

The square root of 1998931648 is about 44709.4134159687. The cubic root of 1998931648 is about 1259.6966700751.

The spelling of 1998931648 in words is "one billion, nine hundred ninety-eight million, nine hundred thirty-one thousand, six hundred forty-eight".