19387453512 has 128 divisors (see below), whose sum is σ = 56273817600. Its totient is φ = 5451833088.

The previous prime is 19387453507. The next prime is 19387453541. The reversal of 19387453512 is 21535478391.

It is a super-2 number, since 2×19387453512² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2886414 + ... + 2893122.

It is an arithmetic number, because the mean of its divisors is an integer number (439639200).

Almost surely, 2^19387453512 is an apocalyptic number.

19387453512 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 19387453512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28136908800).

19387453512 is an abundant number, since it is smaller than the sum of its proper divisors (36886364088).

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

19387453512 is a wasteful number, since it uses less digits than its factorization.

19387453512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6995 (or 6991 counting only the distinct ones).

The product of its digits is 907200, while the sum is 48.

The spelling of 19387453512 in words is "nineteen billion, three hundred eighty-seven million, four hundred fifty-three thousand, five hundred twelve".