3978149128 has 32 divisors (see below), whose sum is σ = 7838804160. Its totient is φ = 1890302400.

The previous prime is 3978149117. The next prime is 3978149191. The reversal of 3978149128 is 8219418793.

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 7 ways as a sum of consecutive naturals, for example, 143548 + ... + 169003.

It is an arithmetic number, because the mean of its divisors is an integer number (244962630).

Almost surely, 2^3978149128 is an apocalyptic number.

It is an amenable number.

3978149128 is a deficient number, since it is larger than the sum of its proper divisors (3860655032).

3978149128 is a wasteful number, since it uses less digits than its factorization.

3978149128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312637 (or 312633 counting only the distinct ones).

The product of its digits is 870912, while the sum is 52.

The square root of 3978149128 is about 63072.5703297400. The cubic root of 3978149128 is about 1584.5052644929.

The spelling of 3978149128 in words is "three billion, nine hundred seventy-eight million, one hundred forty-nine thousand, one hundred twenty-eight".