3965971780 has 12 divisors (see below), whose sum is σ = 8328540780. Its totient is φ = 1586388704.

The previous prime is 3965971741. The next prime is 3965971787. The reversal of 3965971780 is 871795693.

It can be written as a sum of positive squares in 2 ways, for example, as 1519284484 + 2446687296 = 38978^2 + 49464^2 .

It is not an unprimeable number, because it can be changed into a prime (3965971787) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 99149275 + ... + 99149314.

It is an arithmetic number, because the mean of its divisors is an integer number (694045065).

Almost surely, 2^3965971780 is an apocalyptic number.

It is an amenable number.

3965971780 is an abundant number, since it is smaller than the sum of its proper divisors (4362569000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3965971780 is a wasteful number, since it uses less digits than its factorization.

3965971780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198298598 (or 198298596 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 55.

The square root of 3965971780 is about 62975.9619219905. The cubic root of 3965971780 is about 1582.8868574796.

The spelling of 3965971780 in words is "three billion, nine hundred sixty-five million, nine hundred seventy-one thousand, seven hundred eighty".