19419509 has 4 divisors (see below), whose sum is σ = 19506816. Its totient is φ = 19332204.

The previous prime is 19419503. The next prime is 19419511. The reversal of 19419509 is 90591491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19419509 - 2⁴ = 19419493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19419503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43319 + ... + 43764.

It is an arithmetic number, because the mean of its divisors is an integer number (4876704).

Almost surely, 2^19419509 is an apocalyptic number.

It is an amenable number.

19419509 is a deficient number, since it is larger than the sum of its proper divisors (87307).

19419509 is an equidigital number, since it uses as much as digits as its factorization.

19419509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87306.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 19419509 is about 4406.7571977589. The cubic root of 19419509 is about 268.7897778511.

The spelling of 19419509 in words is "nineteen million, four hundred nineteen thousand, five hundred nine".