3857839 has 2 divisors, whose sum is σ = 3857840. Its totient is φ = 3857838.

The previous prime is 3857809. The next prime is 3857863. The reversal of 3857839 is 9387583.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3857839 - 2⁹ = 3857327 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3857795 and 3857804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3857809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1928919 + 1928920.

It is an arithmetic number, because the mean of its divisors is an integer number (1928920).

Almost surely, 2^3857839 is an apocalyptic number.

3857839 is a deficient number, since it is larger than the sum of its proper divisors (1).

3857839 is an equidigital number, since it uses as much as digits as its factorization.

3857839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 43.

The square root of 3857839 is about 1964.1382334245. The cubic root of 3857839 is about 156.8368218179.

The spelling of 3857839 in words is "three million, eight hundred fifty-seven thousand, eight hundred thirty-nine".