3805409 has 4 divisors (see below), whose sum is σ = 3936660. Its totient is φ = 3674160.

The previous prime is 3805393. The next prime is 3805463. The reversal of 3805409 is 9045083.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3045025 + 760384 = 1745^2 + 872^2 .

It is a cyclic number.

It is not a de Polignac number, because 3805409 - 2⁴ = 3805393 is a prime.

It is a super-2 number, since 2×3805409² = 28962275314562, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 131221 = 3805409 / (3 + 8 + 0 + 5 + 4 + 0 + 9).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3805469) 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, 65582 + ... + 65639.

It is an arithmetic number, because the mean of its divisors is an integer number (984165).

Almost surely, 2^3805409 is an apocalyptic number.

It is an amenable number.

3805409 is a deficient number, since it is larger than the sum of its proper divisors (131251).

3805409 is a wasteful number, since it uses less digits than its factorization.

3805409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131250.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 3805409 is about 1950.7457548333. The cubic root of 3805409 is about 156.1230811475.

The spelling of 3805409 in words is "three million, eight hundred five thousand, four hundred nine".