408428809 has 8 divisors (see below), whose sum is σ = 410810400. Its totient is φ = 406054656.

The previous prime is 408428771. The next prime is 408428821. The reversal of 408428809 is 908824804.

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 408428809 - 2¹⁷ = 408297737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (408428509) 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, 136362 + ... + 139324.

It is an arithmetic number, because the mean of its divisors is an integer number (51351300).

Almost surely, 2^408428809 is an apocalyptic number.

It is an amenable number.

408428809 is a deficient number, since it is larger than the sum of its proper divisors (2381591).

408428809 is a wasteful number, since it uses less digits than its factorization.

408428809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3719.

The product of its (nonzero) digits is 147456, while the sum is 43.

The square root of 408428809 is about 20209.6216936389. The cubic root of 408428809 is about 741.9457007947.

The spelling of 408428809 in words is "four hundred eight million, four hundred twenty-eight thousand, eight hundred nine".