19438365380 has 96 divisors (see below), whose sum is σ = 47711462400. Its totient is φ = 6514526592.

The previous prime is 19438365371. The next prime is 19438365409. The reversal of 19438365380 is 8356383491.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1471967 + ... + 1485113.

It is an arithmetic number, because the mean of its divisors is an integer number (496994400).

Almost surely, 2^19438365380 is an apocalyptic number.

19438365380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19438365380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23855731200).

19438365380 is an abundant number, since it is smaller than the sum of its proper divisors (28273097020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19438365380 is a wasteful number, since it uses less digits than its factorization.

19438365380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13401 (or 13399 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 50.

The spelling of 19438365380 in words is "nineteen billion, four hundred thirty-eight million, three hundred sixty-five thousand, three hundred eighty".