19998272 has 56 divisors (see below), whose sum is σ = 46329600. Its totient is φ = 8561280.

The previous prime is 19998263. The next prime is 19998337. The reversal of 19998272 is 27289991.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21497 + ... + 22407.

Almost surely, 2^19998272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19998272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23164800).

19998272 is an abundant number, since it is smaller than the sum of its proper divisors (26331328).

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

19998272 is an frugal number, since it uses more digits than its factorization.

19998272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944 (or 920 counting only the distinct ones).

The product of its digits is 163296, while the sum is 47.

The square root of 19998272 is about 4471.9427545531. The cubic root of 19998272 is about 271.4339439116.

The spelling of 19998272 in words is "nineteen million, nine hundred ninety-eight thousand, two hundred seventy-two".