19439797216 has 96 divisors (see below), whose sum is σ = 44425801728. Its totient is φ = 8201088000.

The previous prime is 19439797207. The next prime is 19439797249. The reversal of 19439797216 is 61279793491.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12279561 + ... + 12281143.

It is an arithmetic number, because the mean of its divisors is an integer number (462768768).

Almost surely, 2^19439797216 is an apocalyptic number.

19439797216 is a gapful number since it is divisible by the number (16) 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 19439797216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22212900864).

19439797216 is an abundant number, since it is smaller than the sum of its proper divisors (24986004512).

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

19439797216 is a wasteful number, since it uses less digits than its factorization.

19439797216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2424 (or 2416 counting only the distinct ones).

The product of its digits is 5143824, while the sum is 58.

The spelling of 19439797216 in words is "nineteen billion, four hundred thirty-nine million, seven hundred ninety-seven thousand, two hundred sixteen".