409609 has 2 divisors, whose sum is σ = 409610. Its totient is φ = 409608.

The previous prime is 409597. The next prime is 409639. The reversal of 409609 is 906904.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 409600 + 9 = 640^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 409609 - 2¹³ = 401417 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (409639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204804 + 204805.

It is an arithmetic number, because the mean of its divisors is an integer number (204805).

2⁴⁰⁹⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

409609 is a deficient number, since it is larger than the sum of its proper divisors (1).

409609 is an equidigital number, since it uses as much as digits as its factorization.

409609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 409609 is about 640.0070312114. The cubic root of 409609 is about 74.2659652700.

The spelling of 409609 in words is "four hundred nine thousand, six hundred nine".