404609 has 4 divisors (see below), whose sum is σ = 406020. Its totient is φ = 403200.

The previous prime is 404597. The next prime is 404671. The reversal of 404609 is 906404.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 297025 + 107584 = 545^2 + 328^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104 + ... + 905.

It is an arithmetic number, because the mean of its divisors is an integer number (101505).

2⁴⁰⁴⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

404609 is a deficient number, since it is larger than the sum of its proper divisors (1411).

404609 is a wasteful number, since it uses less digits than its factorization.

404609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 404609 is about 636.0888302745. The cubic root of 404609 is about 73.9625449606.

The spelling of 404609 in words is "four hundred four thousand, six hundred nine".