8440409 has 8 divisors (see below), whose sum is σ = 8724672. Its totient is φ = 8160880.

The previous prime is 8440391. The next prime is 8440423. The reversal of 8440409 is 9040448.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8440409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8440429) 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, 2642 + ... + 4884.

It is an arithmetic number, because the mean of its divisors is an integer number (1090584).

Almost surely, 2^8440409 is an apocalyptic number.

It is an amenable number.

8440409 is a deficient number, since it is larger than the sum of its proper divisors (284263).

8440409 is a wasteful number, since it uses less digits than its factorization.

8440409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2367.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 8440409 is about 2905.2382002170. The cubic root of 8440409 is about 203.6047148255.

The spelling of 8440409 in words is "eight million, four hundred forty thousand, four hundred nine".