1998984393 has 16 divisors (see below), whose sum is σ = 3384524160. Its totient is φ = 1142276688.

The previous prime is 1998984391. The next prime is 1998984409. The reversal of 1998984393 is 3934898991.

It is a happy number.

1998984393 is a `hidden beast` number, since 1 + 99 + 89 + 84 + 393 = 666.

It is not a de Polignac number, because 1998984393 - 2¹ = 1998984391 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 1998984393.

It is not an unprimeable number, because it can be changed into a prime (1998984391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5288130 + ... + 5288507.

It is an arithmetic number, because the mean of its divisors is an integer number (211532760).

Almost surely, 2^1998984393 is an apocalyptic number.

It is an amenable number.

1998984393 is a deficient number, since it is larger than the sum of its proper divisors (1385539767).

1998984393 is a wasteful number, since it uses less digits than its factorization.

1998984393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10576653 (or 10576647 counting only the distinct ones).

The product of its digits is 15116544, while the sum is 63.

The square root of 1998984393 is about 44710.0032766718. The cubic root of 1998984393 is about 1259.7077496796.

The spelling of 1998984393 in words is "one billion, nine hundred ninety-eight million, nine hundred eighty-four thousand, three hundred ninety-three".