3978921474 has 64 divisors (see below), whose sum is σ = 9736174080. Its totient is φ = 1194446160.

The previous prime is 3978921469. The next prime is 3978921491. The reversal of 3978921474 is 4741298793.

3978921474 is a `hidden beast` number, since 3 + 97 + 89 + 2 + 1 + 474 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 3978921474.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32257 + ... + 94859.

It is an arithmetic number, because the mean of its divisors is an integer number (152127720).

Almost surely, 2^3978921474 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3978921474, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4868087040).

3978921474 is an abundant number, since it is smaller than the sum of its proper divisors (5757252606).

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

3978921474 is a wasteful number, since it uses less digits than its factorization.

3978921474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62732 (or 62726 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The square root of 3978921474 is about 63078.6927099793. The cubic root of 3978921474 is about 1584.6078002094.

The spelling of 3978921474 in words is "three billion, nine hundred seventy-eight million, nine hundred twenty-one thousand, four hundred seventy-four".