3809857 has 2 divisors, whose sum is σ = 3809858. Its totient is φ = 3809856.

The previous prime is 3809849. The next prime is 3809891. The reversal of 3809857 is 7589083.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3207681 + 602176 = 1791^2 + 776^2 .

It is an emirp because it is prime and its reverse (7589083) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3809857 - 2³ = 3809849 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3809837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1904928 + 1904929.

It is an arithmetic number, because the mean of its divisors is an integer number (1904929).

Almost surely, 2^3809857 is an apocalyptic number.

It is an amenable number.

3809857 is a deficient number, since it is larger than the sum of its proper divisors (1).

3809857 is an equidigital number, since it uses as much as digits as its factorization.

3809857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 3809857 is about 1951.8854986909. The cubic root of 3809857 is about 156.1838862694.

It can be divided in two parts, 380985 and 7, that multiplied together give a triangular number (2666895 = T₂₃₀₉).

The spelling of 3809857 in words is "three million, eight hundred nine thousand, eight hundred fifty-seven".