1447813789920 has 576 divisors, whose sum is σ = 5250352214016. Its totient is φ = 376652021760.

The previous prime is 1447813789837. The next prime is 1447813789931. The reversal of 1447813789920 is 299873187441.

1447813789920 is a `hidden beast` number, since 1 + 4 + 478 + 1 + 3 + 78 + 9 + 92 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 267763857 + ... + 267769263.

It is an arithmetic number, because the mean of its divisors is an integer number (9115194816).

Almost surely, 2^{1447813789920} is an apocalyptic number.

1447813789920 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 1447813789920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2625176107008).

1447813789920 is an abundant number, since it is smaller than the sum of its proper divisors (3802538424096).

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

1447813789920 is an equidigital number, since it uses as much as digits as its factorization.

1447813789920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5605 (or 5585 counting only the distinct ones).

The product of its (nonzero) digits is 24385536, while the sum is 63.

The spelling of 1447813789920 in words is "one trillion, four hundred forty-seven billion, eight hundred thirteen million, seven hundred eighty-nine thousand, nine hundred twenty".