3945744857 has 2 divisors, whose sum is σ = 3945744858. Its totient is φ = 3945744856.

The previous prime is 3945744811. The next prime is 3945744871. The reversal of 3945744857 is 7584475493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3383865241 + 561879616 = 58171^2 + 23704^2 .

It is a cyclic number.

It is not a de Polignac number, because 3945744857 - 2¹⁴ = 3945728473 is a prime.

It is not a weakly prime, because it can be changed into another prime (3945744157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1972872428 + 1972872429.

It is an arithmetic number, because the mean of its divisors is an integer number (1972872429).

Almost surely, 2^3945744857 is an apocalyptic number.

It is an amenable number.

3945744857 is a deficient number, since it is larger than the sum of its proper divisors (1).

3945744857 is an equidigital number, since it uses as much as digits as its factorization.

3945744857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16934400, while the sum is 56.

The square root of 3945744857 is about 62815.1642280747. The cubic root of 3945744857 is about 1580.1912999425.

The spelling of 3945744857 in words is "three billion, nine hundred forty-five million, seven hundred forty-four thousand, eight hundred fifty-seven".