408809 has 2 divisors, whose sum is σ = 408810. Its totient is φ = 408808.

The previous prime is 408803. The next prime is 408817. The reversal of 408809 is 908804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225625 + 183184 = 475^2 + 428^2 .

It is a cyclic number.

It is not a de Polignac number, because 408809 - 2⁸ = 408553 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (408803) 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 as a sum of consecutive naturals, namely, 204404 + 204405.

It is an arithmetic number, because the mean of its divisors is an integer number (204405).

2⁴⁰⁸⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

408809 is a deficient number, since it is larger than the sum of its proper divisors (1).

408809 is an equidigital number, since it uses as much as digits as its factorization.

408809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 408809 is about 639.3817326136. The cubic root of 408809 is about 74.2175845837.

The spelling of 408809 in words is "four hundred eight thousand, eight hundred nine".