1997384988 has 12 divisors (see below), whose sum is σ = 4660565000. Its totient is φ = 665794992.

The previous prime is 1997384953. The next prime is 1997384999. The reversal of 1997384988 is 8894837991.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 83224363 + ... + 83224386.

Almost surely, 2^1997384988 is an apocalyptic number.

It is an amenable number.

1997384988 is an abundant number, since it is smaller than the sum of its proper divisors (2663180012).

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

1997384988 is a wasteful number, since it uses less digits than its factorization.

1997384988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166448756 (or 166448754 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 66.

The square root of 1997384988 is about 44692.1132639753. The cubic root of 1997384988 is about 1259.3716922850.

The spelling of 1997384988 in words is "one billion, nine hundred ninety-seven million, three hundred eighty-four thousand, nine hundred eighty-eight".