3928392857 has 2 divisors, whose sum is σ = 3928392858. Its totient is φ = 3928392856.

The previous prime is 3928392791. The next prime is 3928392859. The reversal of 3928392857 is 7582938293.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3557406736 + 370986121 = 59644^2 + 19261^2 .

It is a cyclic number.

It is not a de Polignac number, because 3928392857 - 2¹⁰ = 3928391833 is a prime.

Together with 3928392859, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3928392859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1964196428 + 1964196429.

It is an arithmetic number, because the mean of its divisors is an integer number (1964196429).

Almost surely, 2^3928392857 is an apocalyptic number.

It is an amenable number.

3928392857 is a deficient number, since it is larger than the sum of its proper divisors (1).

3928392857 is an equidigital number, since it uses as much as digits as its factorization.

3928392857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6531840, while the sum is 56.

The square root of 3928392857 is about 62676.8925282675. The cubic root of 3928392857 is about 1577.8715206473.

The spelling of 3928392857 in words is "three billion, nine hundred twenty-eight million, three hundred ninety-two thousand, eight hundred fifty-seven".