19419639 has 8 divisors (see below), whose sum is σ = 25987440. Its totient is φ = 12899136.

The previous prime is 19419611. The next prime is 19419641. The reversal of 19419639 is 93691491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19419639 - 2⁵ = 19419607 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 19419639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19419649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10854 + ... + 12515.

It is an arithmetic number, because the mean of its divisors is an integer number (3248430).

Almost surely, 2^19419639 is an apocalyptic number.

19419639 is a deficient number, since it is larger than the sum of its proper divisors (6567801).

19419639 is a wasteful number, since it uses less digits than its factorization.

19419639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23649.

The product of its digits is 52488, while the sum is 42.

The square root of 19419639 is about 4406.7719478094. The cubic root of 19419639 is about 268.7903776362.

The spelling of 19419639 in words is "nineteen million, four hundred nineteen thousand, six hundred thirty-nine".