609409 has 4 divisors (see below), whose sum is σ = 614916. Its totient is φ = 603904.

The previous prime is 609407. The next prime is 609421. The reversal of 609409 is 904906.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 904906 = 2 ⋅452453.

It can be written as a sum of positive squares in 2 ways, for example, as 278784 + 330625 = 528^2 + 575^2 .

It is a cyclic number.

It is not a de Polignac number, because 609409 - 2¹ = 609407 is a prime.

It is a Duffinian number.

609409 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (609403) 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, 2584 + ... + 2809.

It is an arithmetic number, because the mean of its divisors is an integer number (153729).

2⁶⁰⁹⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

609409 is a deficient number, since it is larger than the sum of its proper divisors (5507).

609409 is a wasteful number, since it uses less digits than its factorization.

609409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5506.

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

The square root of 609409 is about 780.6465269250. The cubic root of 609409 is about 84.7818628144.

The spelling of 609409 in words is "six hundred nine thousand, four hundred nine".