19991472 has 40 divisors (see below), whose sum is σ = 52132080. Its totient is φ = 6600960.

The previous prime is 19991467. The next prime is 19991483. The reversal of 19991472 is 27419991.

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, 3322 + ... + 7142.

It is an arithmetic number, because the mean of its divisors is an integer number (1303302).

Almost surely, 2^19991472 is an apocalyptic number.

19991472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19991472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26066040).

19991472 is an abundant number, since it is smaller than the sum of its proper divisors (32140608).

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

19991472 is a wasteful number, since it uses less digits than its factorization.

19991472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3941 (or 3935 counting only the distinct ones).

The product of its digits is 40824, while the sum is 42.

The square root of 19991472 is about 4471.1823939535. The cubic root of 19991472 is about 271.4031752522.

The spelling of 19991472 in words is "nineteen million, nine hundred ninety-one thousand, four hundred seventy-two".