2405409 has 16 divisors (see below), whose sum is σ = 3400704. Its totient is φ = 1509200.

The previous prime is 2405399. The next prime is 2405437. The reversal of 2405409 is 9045042.

It is a cyclic number.

It is not a de Polignac number, because 2405409 - 2⁴ = 2405393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2405209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4654 + ... + 5144.

It is an arithmetic number, because the mean of its divisors is an integer number (212544).

2^2405409 is an apocalyptic number.

It is an amenable number.

2405409 is a deficient number, since it is larger than the sum of its proper divisors (995295).

2405409 is a wasteful number, since it uses less digits than its factorization.

2405409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 2405409 is about 1550.9381032137. The cubic root of 2405409 is about 133.9870968492.

The spelling of 2405409 in words is "two million, four hundred five thousand, four hundred nine".