3943865 has 8 divisors (see below), whose sum is σ = 4748928. Its totient is φ = 3144240.

The previous prime is 3943859. The next prime is 3943871. The reversal of 3943865 is 5683493.

It is an interprime number because it is at equal distance from previous prime (3943859) and next prime (3943871).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3943865 - 2¹² = 3939769 is a prime.

It is a super-2 number, since 2×3943865² = 31108142276450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 464 + ... + 2846.

It is an arithmetic number, because the mean of its divisors is an integer number (593616).

Almost surely, 2^3943865 is an apocalyptic number.

It is an amenable number.

3943865 is a deficient number, since it is larger than the sum of its proper divisors (805063).

3943865 is a wasteful number, since it uses less digits than its factorization.

3943865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2719.

The product of its digits is 77760, while the sum is 38.

The square root of 3943865 is about 1985.9166649182. The cubic root of 3943865 is about 157.9940311797.

The spelling of 3943865 in words is "three million, nine hundred forty-three thousand, eight hundred sixty-five".