19281473440 has 144 divisors (see below), whose sum is σ = 49448845656. Its totient is φ = 7080181760.

The previous prime is 19281473293. The next prime is 19281473443. The reversal of 19281473440 is 4437418291.

It can be written as a sum of positive squares in 12 ways, for example, as 313573264 + 18967900176 = 17708^2 + 137724^2 .

It is not an unprimeable number, because it can be changed into a prime (19281473443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4570212 + ... + 4574428.

Almost surely, 2^19281473440 is an apocalyptic number.

19281473440 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 19281473440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24724422828).

19281473440 is an abundant number, since it is smaller than the sum of its proper divisors (30167372216).

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

19281473440 is a wasteful number, since it uses less digits than its factorization.

19281473440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4331 (or 4282 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 19281473440 in words is "nineteen billion, two hundred eighty-one million, four hundred seventy-three thousand, four hundred forty".