19438340352 has 144 divisors (see below), whose sum is σ = 52397694720. Its totient is φ = 6396952576.

The previous prime is 19438340333. The next prime is 19438340357. The reversal of 19438340352 is 25304383491.

It is not an unprimeable number, because it can be changed into a prime (19438340357) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25146238 + ... + 25147010.

It is an arithmetic number, because the mean of its divisors is an integer number (363872880).

Almost surely, 2^19438340352 is an apocalyptic number.

19438340352 is a gapful number since it is divisible by the number (12) 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 19438340352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26198847360).

19438340352 is an abundant number, since it is smaller than the sum of its proper divisors (32959354368).

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

19438340352 is a wasteful number, since it uses less digits than its factorization.

19438340352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168 (or 1154 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

The spelling of 19438340352 in words is "nineteen billion, four hundred thirty-eight million, three hundred forty thousand, three hundred fifty-two".