3965472821 has 2 divisors, whose sum is σ = 3965472822. Its totient is φ = 3965472820.

The previous prime is 3965472781. The next prime is 3965472829. The reversal of 3965472821 is 1282745693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3374448100 + 591024721 = 58090^2 + 24311^2 .

It is a cyclic number.

It is not a de Polignac number, because 3965472821 - 2¹⁸ = 3965210677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3965472829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1982736410 + 1982736411.

It is an arithmetic number, because the mean of its divisors is an integer number (1982736411).

Almost surely, 2^3965472821 is an apocalyptic number.

It is an amenable number.

3965472821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3965472821 is an equidigital number, since it uses as much as digits as its factorization.

3965472821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 47.

The square root of 3965472821 is about 62972.0002937814. Note that the first 3 decimals coincide. The cubic root of 3965472821 is about 1582.8204736851.

The spelling of 3965472821 in words is "three billion, nine hundred sixty-five million, four hundred seventy-two thousand, eight hundred twenty-one".