3977821213 has 2 divisors, whose sum is σ = 3977821214. Its totient is φ = 3977821212.

The previous prime is 3977821187. The next prime is 3977821219. The reversal of 3977821213 is 3121287793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3299583364 + 678237849 = 57442^2 + 26043^2 .

It is a cyclic number.

It is not a de Polignac number, because 3977821213 - 2²⁹ = 3440950301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3977821213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3977821219) 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 as a sum of consecutive naturals, namely, 1988910606 + 1988910607.

It is an arithmetic number, because the mean of its divisors is an integer number (1988910607).

Almost surely, 2^3977821213 is an apocalyptic number.

It is an amenable number.

3977821213 is a deficient number, since it is larger than the sum of its proper divisors (1).

3977821213 is an equidigital number, since it uses as much as digits as its factorization.

3977821213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 43.

The square root of 3977821213 is about 63069.9707705656. The cubic root of 3977821213 is about 1584.4617268825.

The spelling of 3977821213 in words is "three billion, nine hundred seventy-seven million, eight hundred twenty-one thousand, two hundred thirteen".