3978729345 has 32 divisors (see below), whose sum is σ = 6492483072. Its totient is φ = 2079896832.

The previous prime is 3978729343. The next prime is 3978729361. The reversal of 3978729345 is 5439278793.

3978729345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3978729345 - 2¹ = 3978729343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3978729343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1129527 + ... + 1133043.

It is an arithmetic number, because the mean of its divisors is an integer number (202890096).

Almost surely, 2^3978729345 is an apocalyptic number.

It is an amenable number.

3978729345 is a deficient number, since it is larger than the sum of its proper divisors (2513753727).

3978729345 is a wasteful number, since it uses less digits than its factorization.

3978729345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5001.

The product of its digits is 11430720, while the sum is 57.

The square root of 3978729345 is about 63077.1697605401. The cubic root of 3978729345 is about 1584.5822946367.

The spelling of 3978729345 in words is "three billion, nine hundred seventy-eight million, seven hundred twenty-nine thousand, three hundred forty-five".