3805421 has 4 divisors (see below), whose sum is σ = 3810144. Its totient is φ = 3800700.

The previous prime is 3805393. The next prime is 3805463. The reversal of 3805421 is 1245083.

3805421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 3805421 - 2⁶ = 3805357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3805471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 815 + ... + 2876.

It is an arithmetic number, because the mean of its divisors is an integer number (952536).

Almost surely, 2^3805421 is an apocalyptic number.

It is an amenable number.

3805421 is a deficient number, since it is larger than the sum of its proper divisors (4723).

3805421 is a wasteful number, since it uses less digits than its factorization.

3805421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4722.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 3805421 is about 1950.7488305776. The cubic root of 3805421 is about 156.1232452538.

The spelling of 3805421 in words is "three million, eight hundred five thousand, four hundred twenty-one".