19448813 has 4 divisors (see below), whose sum is σ = 19767708. Its totient is φ = 19129920.

The previous prime is 19448789. The next prime is 19448839. The reversal of 19448813 is 31884491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31884491 = 37 ⋅861743.

It can be written as a sum of positive squares in 2 ways, for example, as 2696164 + 16752649 = 1642^2 + 4093^2 .

It is a cyclic number.

It is not a de Polignac number, because 19448813 - 2⁸ = 19448557 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 (19448843) 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 3 ways as a sum of consecutive naturals, for example, 159356 + ... + 159477.

It is an arithmetic number, because the mean of its divisors is an integer number (4941927).

Almost surely, 2^19448813 is an apocalyptic number.

It is an amenable number.

19448813 is a deficient number, since it is larger than the sum of its proper divisors (318895).

19448813 is an equidigital number, since it uses as much as digits as its factorization.

19448813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318894.

The product of its digits is 27648, while the sum is 38.

The square root of 19448813 is about 4410.0808382614. The cubic root of 19448813 is about 268.9249109800.

The spelling of 19448813 in words is "nineteen million, four hundred forty-eight thousand, eight hundred thirteen".