3978444809 has 4 divisors (see below), whose sum is σ = 3978570960. Its totient is φ = 3978318660.

The previous prime is 3978444719. The next prime is 3978444817. The reversal of 3978444809 is 9084448793.

3978444809 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3978444809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3978444829) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 31382 + ... + 94560.

It is an arithmetic number, because the mean of its divisors is an integer number (994642740).

Almost surely, 2^3978444809 is an apocalyptic number.

It is an amenable number.

3978444809 is a deficient number, since it is larger than the sum of its proper divisors (126151).

3978444809 is an equidigital number, since it uses as much as digits as its factorization.

3978444809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126150.

The product of its (nonzero) digits is 6967296, while the sum is 56.

The square root of 3978444809 is about 63074.9142607424. The cubic root of 3978444809 is about 1584.5445203109.

The spelling of 3978444809 in words is "three billion, nine hundred seventy-eight million, four hundred forty-four thousand, eight hundred nine".