3905409 has 8 divisors (see below), whose sum is σ = 5266080. Its totient is φ = 2574176.

The previous prime is 3905383. The next prime is 3905413. The reversal of 3905409 is 9045093.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3905409 - 2⁹ = 3904897 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3905449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7047 + ... + 7580.

It is an arithmetic number, because the mean of its divisors is an integer number (658260).

Almost surely, 2^3905409 is an apocalyptic number.

It is an amenable number.

3905409 is a deficient number, since it is larger than the sum of its proper divisors (1360671).

3905409 is a wasteful number, since it uses less digits than its factorization.

3905409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14719.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 3905409 is about 1976.2107681115. The cubic root of 3905409 is about 157.4788280939.

The spelling of 3905409 in words is "three million, nine hundred five thousand, four hundred nine".