3957857 has 2 divisors, whose sum is σ = 3957858. Its totient is φ = 3957856.

The previous prime is 3957847. The next prime is 3957859. The reversal of 3957857 is 7587593.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2825761 + 1132096 = 1681^2 + 1064^2 .

It is a cyclic number.

It is not a de Polignac number, because 3957857 - 2¹⁰ = 3956833 is a prime.

Together with 3957859, 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 (3957859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1978928 + 1978929.

It is an arithmetic number, because the mean of its divisors is an integer number (1978929).

Almost surely, 2^3957857 is an apocalyptic number.

It is an amenable number.

3957857 is a deficient number, since it is larger than the sum of its proper divisors (1).

3957857 is an equidigital number, since it uses as much as digits as its factorization.

3957857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 264600, while the sum is 44.

The square root of 3957857 is about 1989.4363523370. The cubic root of 3957857 is about 158.1806538046.

The spelling of 3957857 in words is "three million, nine hundred fifty-seven thousand, eight hundred fifty-seven".