19491072 has 72 divisors (see below), whose sum is σ = 53225760. Its totient is φ = 6328320.

The previous prime is 19491049. The next prime is 19491091. The reversal of 19491072 is 27019491.

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, 31179 + ... + 31797.

Almost surely, 2^19491072 is an apocalyptic number.

19491072 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 19491072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26612880).

19491072 is an abundant number, since it is smaller than the sum of its proper divisors (33734688).

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

19491072 is an equidigital number, since it uses as much as digits as its factorization.

19491072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679 (or 665 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 19491072 is about 4414.8694204925. The cubic root of 19491072 is about 269.1195462805.

The spelling of 19491072 in words is "nineteen million, four hundred ninety-one thousand, seventy-two".