1998385889208 has 64 divisors (see below), whose sum is σ = 5107601953440. Its totient is φ = 651329462784.

The previous prime is 1998385889177. The next prime is 1998385889219. The reversal of 1998385889208 is 8029885838991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2308291 + ... + 3053682.

Almost surely, 2^{1998385889208} is an apocalyptic number.

It is an amenable number.

1998385889208 is an abundant number, since it is smaller than the sum of its proper divisors (3109216064232).

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

1998385889208 is a wasteful number, since it uses less digits than its factorization.

1998385889208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5362328 (or 5362324 counting only the distinct ones).

The product of its (nonzero) digits is 716636160, while the sum is 78.

The spelling of 1998385889208 in words is "one trillion, nine hundred ninety-eight billion, three hundred eighty-five million, eight hundred eighty-nine thousand, two hundred eight".