19998916 has 12 divisors (see below), whose sum is σ = 39997888. Its totient is φ = 8570952.

The previous prime is 19998899. The next prime is 19998917. The reversal of 19998916 is 61989991.

19998916 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (19998917) 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, 357096 + ... + 357151.

Almost surely, 2^19998916 is an apocalyptic number.

It is an amenable number.

19998916 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

19998916 is a wasteful number, since it uses less digits than its factorization.

19998916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714258 (or 714256 counting only the distinct ones).

The product of its digits is 314928, while the sum is 52.

The square root of 19998916 is about 4472.0147584730. The cubic root of 19998916 is about 271.4368575231.

The spelling of 19998916 in words is "nineteen million, nine hundred ninety-eight thousand, nine hundred sixteen".