3856891 has 2 divisors, whose sum is σ = 3856892. Its totient is φ = 3856890.

The previous prime is 3856877. The next prime is 3856903. The reversal of 3856891 is 1986583.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3856891 - 2⁷ = 3856763 is a prime.

It is not a weakly prime, because it can be changed into another prime (3856861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1928445 + 1928446.

It is an arithmetic number, because the mean of its divisors is an integer number (1928446).

Almost surely, 2^3856891 is an apocalyptic number.

3856891 is a deficient number, since it is larger than the sum of its proper divisors (1).

3856891 is an equidigital number, since it uses as much as digits as its factorization.

3856891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 40.

The square root of 3856891 is about 1963.8968913871. The cubic root of 3856891 is about 156.8239740823.

The spelling of 3856891 in words is "three million, eight hundred fifty-six thousand, eight hundred ninety-one".