3857869 has 2 divisors, whose sum is σ = 3857870. Its totient is φ = 3857868.

The previous prime is 3857863. The next prime is 3857873. The reversal of 3857869 is 9687583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3020644 + 837225 = 1738^2 + 915^2 .

It is an emirp because it is prime and its reverse (9687583) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3857869 - 2¹⁷ = 3726797 is a prime.

It is a super-2 number, since 2×3857869² = 29766306442322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3857863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1928934 + 1928935.

It is an arithmetic number, because the mean of its divisors is an integer number (1928935).

Almost surely, 2^3857869 is an apocalyptic number.

It is an amenable number.

3857869 is a deficient number, since it is larger than the sum of its proper divisors (1).

3857869 is an equidigital number, since it uses as much as digits as its factorization.

3857869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 46.

The square root of 3857869 is about 1964.1458703467. The cubic root of 3857869 is about 156.8372283575.

The spelling of 3857869 in words is "three million, eight hundred fifty-seven thousand, eight hundred sixty-nine".