3988487857 has 2 divisors, whose sum is σ = 3988487858. Its totient is φ = 3988487856.

The previous prime is 3988487843. The next prime is 3988487897. The reversal of 3988487857 is 7587848893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3904875121 + 83612736 = 62489^2 + 9144^2 .

It is an emirp because it is prime and its reverse (7587848893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3988487857 - 2⁷ = 3988487729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3988487792 and 3988487801.

It is not a weakly prime, because it can be changed into another prime (3988487897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1994243928 + 1994243929.

It is an arithmetic number, because the mean of its divisors is an integer number (1994243929).

Almost surely, 2^3988487857 is an apocalyptic number.

It is an amenable number.

3988487857 is a deficient number, since it is larger than the sum of its proper divisors (1).

3988487857 is an equidigital number, since it uses as much as digits as its factorization.

3988487857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108380160, while the sum is 67.

The square root of 3988487857 is about 63154.4761438174. The cubic root of 3988487857 is about 1585.8767230148.

The spelling of 3988487857 in words is "three billion, nine hundred eighty-eight million, four hundred eighty-seven thousand, eight hundred fifty-seven".