4021841 has 4 divisors (see below), whose sum is σ = 4060992. Its totient is φ = 3982692.

The previous prime is 4021777. The next prime is 4021867. The reversal of 4021841 is 1481204.

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.

It is a cyclic number.

It is not a de Polignac number, because 4021841 - 2⁶ = 4021777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4021891) 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 in 3 ways as a sum of consecutive naturals, for example, 19421 + ... + 19626.

It is an arithmetic number, because the mean of its divisors is an integer number (1015248).

Almost surely, 2^4021841 is an apocalyptic number.

It is an amenable number.

4021841 is a deficient number, since it is larger than the sum of its proper divisors (39151).

4021841 is a wasteful number, since it uses less digits than its factorization.

4021841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39150.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 4021841 is about 2005.4528166975. The cubic root of 4021841 is about 159.0285011471.

The spelling of 4021841 in words is "four million, twenty-one thousand, eight hundred forty-one".