19891048 has 8 divisors (see below), whose sum is σ = 37295730. Its totient is φ = 9945520.

The previous prime is 19891031. The next prime is 19891049. The reversal of 19891048 is 84019891.

It can be written as a sum of positive squares in only one way, i.e., 14424804 + 5466244 = 3798^2 + 2338^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 19891048.

It is not an unprimeable number, because it can be changed into a prime (19891049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1243183 + ... + 1243198.

Almost surely, 2^19891048 is an apocalyptic number.

It is an amenable number.

19891048 is a deficient number, since it is larger than the sum of its proper divisors (17404682).

19891048 is a wasteful number, since it uses less digits than its factorization.

19891048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2486387 (or 2486383 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 19891048 is about 4459.9381161626. The cubic root of 19891048 is about 270.9479618495.

The spelling of 19891048 in words is "nineteen million, eight hundred ninety-one thousand, forty-eight".