19389448516 has 9 divisors (see below), whose sum is σ = 33932022271. Its totient is φ = 9694585012.

The previous prime is 19389448499. The next prime is 19389448543. The reversal of 19389448516 is 61584498391.

The square root of 19389448516 is 139246.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×19389448516² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 2 ways as a sum of consecutive naturals, for example, 243681 + ... + 313303.

Almost surely, 2^19389448516 is an apocalyptic number.

19389448516 is the 139246-th square number.

It is an amenable number.

19389448516 is a deficient number, since it is larger than the sum of its proper divisors (14542573755).

19389448516 is an frugal number, since it uses more digits than its factorization.

19389448516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139250 (or 69625 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 58.

The spelling of 19389448516 in words is "nineteen billion, three hundred eighty-nine million, four hundred forty-eight thousand, five hundred sixteen".