19488913 has 4 divisors (see below), whose sum is σ = 19502260. Its totient is φ = 19475568.

The previous prime is 19488901. The next prime is 19488923. The reversal of 19488913 is 31988491.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13786369 + 5702544 = 3713^2 + 2388^2 .

It is a cyclic number.

It is not a de Polignac number, because 19488913 - 2⁹ = 19488401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19488913.

It is not an unprimeable number, because it can be changed into a prime (19488923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4170 + ... + 7507.

It is an arithmetic number, because the mean of its divisors is an integer number (4875565).

Almost surely, 2^19488913 is an apocalyptic number.

It is an amenable number.

19488913 is a deficient number, since it is larger than the sum of its proper divisors (13347).

19488913 is a wasteful number, since it uses less digits than its factorization.

19488913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13346.

The product of its digits is 62208, while the sum is 43.

The square root of 19488913 is about 4414.6248991279. The cubic root of 19488913 is about 269.1096092427.

The spelling of 19488913 in words is "nineteen million, four hundred eighty-eight thousand, nine hundred thirteen".