3927981705965 has 4 divisors (see below), whose sum is σ = 4713578047164. Its totient is φ = 3142385364768.

The previous prime is 3927981705961. The next prime is 3927981706003. The reversal of 3927981705965 is 5695071897293.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1741359995236 + 2186621710729 = 1319606^2 + 1478723^2 .

It is a cyclic number.

It is not a de Polignac number, because 3927981705965 - 2² = 3927981705961 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3927981705961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 392798170592 + ... + 392798170601.

It is an arithmetic number, because the mean of its divisors is an integer number (1178394511791).

Almost surely, 2^{3927981705965} is an apocalyptic number.

It is an amenable number.

3927981705965 is a deficient number, since it is larger than the sum of its proper divisors (785596341199).

3927981705965 is an equidigital number, since it uses as much as digits as its factorization.

3927981705965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785596341198.

The product of its (nonzero) digits is 257191200, while the sum is 71.

The spelling of 3927981705965 in words is "three trillion, nine hundred twenty-seven billion, nine hundred eighty-one million, seven hundred five thousand, nine hundred sixty-five".