19897384752 has 160 divisors (see below), whose sum is σ = 65323596800. Its totient is φ = 5680461312.

The previous prime is 19897384739. The next prime is 19897384753. The reversal of 19897384752 is 25748379891.

19897384752 is a `hidden beast` number, since 1 + 98 + 9 + 73 + 8 + 475 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 19897384752.

It is not an unprimeable number, because it can be changed into a prime (19897384753) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6460749 + ... + 6463827.

It is an arithmetic number, because the mean of its divisors is an integer number (408272480).

Almost surely, 2^19897384752 is an apocalyptic number.

19897384752 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 19897384752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32661798400).

19897384752 is an abundant number, since it is smaller than the sum of its proper divisors (45426212048).

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

19897384752 is a wasteful number, since it uses less digits than its factorization.

19897384752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5240 (or 5228 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 63.

The spelling of 19897384752 in words is "nineteen billion, eight hundred ninety-seven million, three hundred eighty-four thousand, seven hundred fifty-two".