3985841 has 4 divisors (see below), whose sum is σ = 3990000. Its totient is φ = 3981684.

The previous prime is 3985829. The next prime is 3985843. The reversal of 3985841 is 1485893.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1485893 = 271 ⋅5483.

It is a cyclic number.

It is not a de Polignac number, because 3985841 - 2⁶ = 3985777 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3985795 and 3985804.

It is not an unprimeable number, because it can be changed into a prime (3985843) 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, 170 + ... + 2828.

It is an arithmetic number, because the mean of its divisors is an integer number (997500).

Almost surely, 2^3985841 is an apocalyptic number.

It is an amenable number.

3985841 is a deficient number, since it is larger than the sum of its proper divisors (4159).

3985841 is a wasteful number, since it uses less digits than its factorization.

3985841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4158.

The product of its digits is 34560, while the sum is 38.

The square root of 3985841 is about 1996.4571119861. The cubic root of 3985841 is about 158.5525836669.

The spelling of 3985841 in words is "three million, nine hundred eighty-five thousand, eight hundred forty-one".