3991383449280 has 560 divisors, whose sum is σ = 14963278176000. Its totient is φ = 1007138064384.

The previous prime is 3991383449279. The next prime is 3991383449309. The reversal of 3991383449280 is 829443831993.

3991383449280 is a `hidden beast` number, since 3 + 9 + 9 + 1 + 3 + 8 + 344 + 9 + 280 = 666.

It is a super-2 number, since 2×3991383449280² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 452584711 + ... + 452593529.

It is an arithmetic number, because the mean of its divisors is an integer number (26720139600).

Almost surely, 2^{3991383449280} is an apocalyptic number.

3991383449280 is a gapful number since it is divisible by the number (30) 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 3991383449280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7481639088000).

3991383449280 is an abundant number, since it is smaller than the sum of its proper divisors (10971894726720).

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

3991383449280 is a wasteful number, since it uses less digits than its factorization.

3991383449280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9786 (or 9767 counting only the distinct ones).

The product of its (nonzero) digits is 40310784, while the sum is 63.

The spelling of 3991383449280 in words is "three trillion, nine hundred ninety-one billion, three hundred eighty-three million, four hundred forty-nine thousand, two hundred eighty".