19998988 has 12 divisors (see below), whose sum is σ = 35035000. Its totient is φ = 9988992.

The previous prime is 19998977. The next prime is 19998989. The reversal of 19998988 is 88989991.

It is not an unprimeable number, because it can be changed into a prime (19998989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2995 + ... + 6997.

Almost surely, 2^19998988 is an apocalyptic number.

It is an amenable number.

19998988 is a deficient number, since it is larger than the sum of its proper divisors (15036012).

19998988 is a wasteful number, since it uses less digits than its factorization.

19998988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5256 (or 5254 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 61.

The square root of 19998988 is about 4472.0228085286. The cubic root of 19998988 is about 271.4371832646.

The spelling of 19998988 in words is "nineteen million, nine hundred ninety-eight thousand, nine hundred eighty-eight".