19419539407 has 4 divisors (see below), whose sum is σ = 19491198496. Its totient is φ = 19347880320.

The previous prime is 19419539401. The next prime is 19419539443. The reversal of 19419539407 is 70493591491.

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

It is a cyclic number.

It is not a de Polignac number, because 19419539407 - 2²³ = 19411150799 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 (19419539401) 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, 35829138 + ... + 35829679.

It is an arithmetic number, because the mean of its divisors is an integer number (4872799624).

Almost surely, 2^19419539407 is an apocalyptic number.

19419539407 is a deficient number, since it is larger than the sum of its proper divisors (71659089).

19419539407 is an equidigital number, since it uses as much as digits as its factorization.

19419539407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71659088.

The product of its (nonzero) digits is 1224720, while the sum is 52.

The spelling of 19419539407 in words is "nineteen billion, four hundred nineteen million, five hundred thirty-nine thousand, four hundred seven".