19991048 has 128 divisors (see below), whose sum is σ = 52254720. Its totient is φ = 6927360.

The previous prime is 19991047. The next prime is 19991051. The reversal of 19991048 is 84019991.

It is a junction number, because it is equal to n+sod(n) for n = 19990996 and 19991014.

It is not an unprimeable number, because it can be changed into a prime (19991047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 240815 + ... + 240897.

It is an arithmetic number, because the mean of its divisors is an integer number (408240).

Almost surely, 2^19991048 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 19991048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26127360).

19991048 is an abundant number, since it is smaller than the sum of its proper divisors (32263672).

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

19991048 is a wasteful number, since it uses less digits than its factorization.

19991048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 19991048 is about 4471.1349789511. The cubic root of 19991048 is about 271.4012565047.

The spelling of 19991048 in words is "nineteen million, nine hundred ninety-one thousand, forty-eight".