3982820857 has 2 divisors, whose sum is σ = 3982820858. Its totient is φ = 3982820856.

The previous prime is 3982820851. The next prime is 3982820887. The reversal of 3982820857 is 7580282893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3905750016 + 77070841 = 62496^2 + 8779^2 .

It is a cyclic number.

It is not a de Polignac number, because 3982820857 - 2¹¹ = 3982818809 is a prime.

It is not a weakly prime, because it can be changed into another prime (3982820851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1991410428 + 1991410429.

It is an arithmetic number, because the mean of its divisors is an integer number (1991410429).

Almost surely, 2^3982820857 is an apocalyptic number.

It is an amenable number.

3982820857 is a deficient number, since it is larger than the sum of its proper divisors (1).

3982820857 is an equidigital number, since it uses as much as digits as its factorization.

3982820857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1935360, while the sum is 52.

The square root of 3982820857 is about 63109.5940170748. The cubic root of 3982820857 is about 1585.1252750548.

The spelling of 3982820857 in words is "three billion, nine hundred eighty-two million, eight hundred twenty thousand, eight hundred fifty-seven".