3999871 has 2 divisors, whose sum is σ = 3999872. Its totient is φ = 3999870.

The previous prime is 3999859. The next prime is 3999893. The reversal of 3999871 is 1789993.

It is a weak prime.

It is an emirp because it is prime and its reverse (1789993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3999871 - 2¹³ = 3991679 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3999851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999935 + 1999936.

It is an arithmetic number, because the mean of its divisors is an integer number (1999936).

Almost surely, 2^3999871 is an apocalyptic number.

3999871 is a deficient number, since it is larger than the sum of its proper divisors (1).

3999871 is an equidigital number, since it uses as much as digits as its factorization.

3999871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 46.

The square root of 3999871 is about 1999.9677497400. The cubic root of 3999871 is about 158.7383987223.

The spelling of 3999871 in words is "three million, nine hundred ninety-nine thousand, eight hundred seventy-one".