19387648 has 72 divisors (see below), whose sum is σ = 45785600. Its totient is φ = 8017920.

The previous prime is 19387639. The next prime is 19387649. The reversal of 19387648 is 84678391.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19387598 and 19387607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19387649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55378 + ... + 55726.

Almost surely, 2^19387648 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 19387648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22892800).

19387648 is an abundant number, since it is smaller than the sum of its proper divisors (26397952).

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

19387648 is an equidigital number, since it uses as much as digits as its factorization.

19387648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403 (or 389 counting only the distinct ones).

The product of its digits is 290304, while the sum is 46.

The square root of 19387648 is about 4403.1406972751. The cubic root of 19387648 is about 268.6426989711.

The spelling of 19387648 in words is "nineteen million, three hundred eighty-seven thousand, six hundred forty-eight".