3995861 has 4 divisors (see below), whose sum is σ = 4088832. Its totient is φ = 3902892.

The previous prime is 3995851. The next prime is 3995891. The reversal of 3995861 is 1685993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1685993 = 101 ⋅16693.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3995861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3995851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46421 + ... + 46506.

It is an arithmetic number, because the mean of its divisors is an integer number (1022208).

Almost surely, 2^3995861 is an apocalyptic number.

It is an amenable number.

3995861 is a deficient number, since it is larger than the sum of its proper divisors (92971).

3995861 is an equidigital number, since it uses as much as digits as its factorization.

3995861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92970.

The product of its digits is 58320, while the sum is 41.

The square root of 3995861 is about 1998.9649821845. The cubic root of 3995861 is about 158.6853341931.

The spelling of 3995861 in words is "three million, nine hundred ninety-five thousand, eight hundred sixty-one".