3971261378 has 16 divisors (see below), whose sum is σ = 6868126080. Its totient is φ = 1686906816.

The previous prime is 3971261377. The next prime is 3971261423. The reversal of 3971261378 is 8731621793.

3971261378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (3971261377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1253558 + ... + 1256721.

It is an arithmetic number, because the mean of its divisors is an integer number (429257880).

Almost surely, 2^3971261378 is an apocalyptic number.

3971261378 is a deficient number, since it is larger than the sum of its proper divisors (2896864702).

3971261378 is a wasteful number, since it uses less digits than its factorization.

3971261378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2510401.

The product of its digits is 381024, while the sum is 47.

The square root of 3971261378 is about 63017.9448887378. The cubic root of 3971261378 is about 1583.5902677209.

The spelling of 3971261378 in words is "three billion, nine hundred seventy-one million, two hundred sixty-one thousand, three hundred seventy-eight".