19004490719 has 4 divisors (see below), whose sum is σ = 19004881896. Its totient is φ = 19004099544.

The previous prime is 19004490677. The next prime is 19004490721. The reversal of 19004490719 is 91709440091.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91709440091 = 4519 ⋅20294189.

It is a cyclic number.

It is not a de Polignac number, because 19004490719 - 2²⁸ = 18736055263 is a prime.

It is a super-2 number, since 2×19004490719² (a number of 21 digits) contains 22 as substring.

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 19004490719.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19004490319) 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, 110324 + ... + 224009.

It is an arithmetic number, because the mean of its divisors is an integer number (4751220474).

Almost surely, 2^19004490719 is an apocalyptic number.

19004490719 is a deficient number, since it is larger than the sum of its proper divisors (391177).

19004490719 is an equidigital number, since it uses as much as digits as its factorization.

19004490719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391176.

The product of its (nonzero) digits is 81648, while the sum is 44.

The spelling of 19004490719 in words is "nineteen billion, four million, four hundred ninety thousand, seven hundred nineteen".