8405409 has 4 divisors (see below), whose sum is σ = 11207216. Its totient is φ = 5603604.

The previous prime is 8405407. The next prime is 8405417. The reversal of 8405409 is 9045048.

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 not a de Polignac number, because 8405409 - 2¹ = 8405407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8405407) 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, 1400899 + ... + 1400904.

It is an arithmetic number, because the mean of its divisors is an integer number (2801804).

Almost surely, 2^8405409 is an apocalyptic number.

It is an amenable number.

8405409 is a deficient number, since it is larger than the sum of its proper divisors (2801807).

8405409 is a wasteful number, since it uses less digits than its factorization.

8405409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2801806.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 8405409 is about 2899.2083402198. The cubic root of 8405409 is about 203.3228944445.

The spelling of 8405409 in words is "eight million, four hundred five thousand, four hundred nine".