3857891 has 2 divisors, whose sum is σ = 3857892. Its totient is φ = 3857890.

The previous prime is 3857873. The next prime is 3857911. The reversal of 3857891 is 1987583.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3857891 is a prime.

It is not a weakly prime, because it can be changed into another prime (3857801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1928945 + 1928946.

It is an arithmetic number, because the mean of its divisors is an integer number (1928946).

Almost surely, 2^3857891 is an apocalyptic number.

3857891 is a deficient number, since it is larger than the sum of its proper divisors (1).

3857891 is an equidigital number, since it uses as much as digits as its factorization.

3857891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 41.

The square root of 3857891 is about 1964.1514707374. The cubic root of 3857891 is about 156.8375264852.

The spelling of 3857891 in words is "three million, eight hundred fifty-seven thousand, eight hundred ninety-one".