3995851 has 2 divisors, whose sum is σ = 3995852. Its totient is φ = 3995850.

The previous prime is 3995843. The next prime is 3995891. The reversal of 3995851 is 1585993.

It is an a-pointer prime, because the next prime (3995891) can be obtained adding 3995851 to its sum of digits (40).

It is a weak prime.

It is an emirp because it is prime and its reverse (1585993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3995851 - 2³ = 3995843 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3995891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1997925 + 1997926.

It is an arithmetic number, because the mean of its divisors is an integer number (1997926).

Almost surely, 2^3995851 is an apocalyptic number.

3995851 is a deficient number, since it is larger than the sum of its proper divisors (1).

3995851 is an equidigital number, since it uses as much as digits as its factorization.

3995851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 40.

The square root of 3995851 is about 1998.9624808885. The cubic root of 3995851 is about 158.6852018182.

The spelling of 3995851 in words is "three million, nine hundred ninety-five thousand, eight hundred fifty-one".