3891971395 has 16 divisors (see below), whose sum is σ = 5062946112. Its totient is φ = 2855030400.

The previous prime is 3891971393. The next prime is 3891971407. The reversal of 3891971395 is 5931791983.

It is not a de Polignac number, because 3891971395 - 2¹ = 3891971393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3891971393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188452 + ... + 208081.

It is an arithmetic number, because the mean of its divisors is an integer number (316434132).

Almost surely, 2^3891971395 is an apocalyptic number.

3891971395 is a deficient number, since it is larger than the sum of its proper divisors (1170974717).

3891971395 is a wasteful number, since it uses less digits than its factorization.

3891971395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396702.

The product of its digits is 1837080, while the sum is 55.

The square root of 3891971395 is about 62385.6665829580. Note that the first 3 decimals coincide. The cubic root of 3891971395 is about 1572.9800452461.

The spelling of 3891971395 in words is "three billion, eight hundred ninety-one million, nine hundred seventy-one thousand, three hundred ninety-five".