3809021 has 4 divisors (see below), whose sum is σ = 3890112. Its totient is φ = 3727932.

The previous prime is 3808999. The next prime is 3809051. The reversal of 3809021 is 1209083.

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 3809021 - 2¹⁴ = 3792637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3809051) 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, 40475 + ... + 40568.

It is an arithmetic number, because the mean of its divisors is an integer number (972528).

Almost surely, 2^3809021 is an apocalyptic number.

It is an amenable number.

3809021 is a deficient number, since it is larger than the sum of its proper divisors (81091).

3809021 is an equidigital number, since it uses as much as digits as its factorization.

3809021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81090.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 3809021 is about 1951.6713350357. The cubic root of 3809021 is about 156.1724615816.

The spelling of 3809021 in words is "three million, eight hundred nine thousand, twenty-one".