8428409 has 8 divisors (see below), whose sum is σ = 9266400. Its totient is φ = 7602400.

The previous prime is 8428403. The next prime is 8428417. The reversal of 8428409 is 9048248.

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 8428409 - 2⁴ = 8428393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8428403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1484 + ... + 4365.

It is an arithmetic number, because the mean of its divisors is an integer number (1158300).

Almost surely, 2^8428409 is an apocalyptic number.

It is an amenable number.

8428409 is a deficient number, since it is larger than the sum of its proper divisors (837991).

8428409 is a wasteful number, since it uses less digits than its factorization.

8428409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5991.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 8428409 is about 2903.1722305092. The cubic root of 8428409 is about 203.5081786119.

The spelling of 8428409 in words is "eight million, four hundred twenty-eight thousand, four hundred nine".