19448018449 has 4 divisors (see below), whose sum is σ = 19451050864. Its totient is φ = 19444986036.

The previous prime is 19448018431. The next prime is 19448018489. The reversal of 19448018449 is 94481084491.

It is a happy number.

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 19448018449 - 2⁹ = 19448017937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19448018396 and 19448018405.

It is not an unprimeable number, because it can be changed into a prime (19448018419) 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, 1506567 + ... + 1519420.

It is an arithmetic number, because the mean of its divisors is an integer number (4862762716).

Almost surely, 2^19448018449 is an apocalyptic number.

It is an amenable number.

19448018449 is a deficient number, since it is larger than the sum of its proper divisors (3032415).

19448018449 is an equidigital number, since it uses as much as digits as its factorization.

19448018449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3032414.

The product of its (nonzero) digits is 1327104, while the sum is 52.

The spelling of 19448018449 in words is "nineteen billion, four hundred forty-eight million, eighteen thousand, four hundred forty-nine".