3806421 has 4 divisors (see below), whose sum is σ = 5075232. Its totient is φ = 2537612.

The previous prime is 3806347. The next prime is 3806423. The reversal of 3806421 is 1246083.

It is a happy number.

3806421 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.

It is a cyclic number.

It is not a de Polignac number, because 3806421 - 2¹¹ = 3804373 is a prime.

It is an Ulam number.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 3806391 and 3806400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3806423) 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, 634401 + ... + 634406.

It is an arithmetic number, because the mean of its divisors is an integer number (1268808).

Almost surely, 2^3806421 is an apocalyptic number.

It is an amenable number.

3806421 is a deficient number, since it is larger than the sum of its proper divisors (1268811).

3806421 is a wasteful number, since it uses less digits than its factorization.

3806421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268810.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 3806421 is about 1951.0051255699. The cubic root of 3806421 is about 156.1369195684.

The spelling of 3806421 in words is "three million, eight hundred six thousand, four hundred twenty-one".