1209609 has 6 divisors (see below), whose sum is σ = 1747226. Its totient is φ = 806400.

The previous prime is 1209587. The next prime is 1209617. The reversal of 1209609 is 9069021.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1071225 + 138384 = 1035^2 + 372^2 .

It is not a de Polignac number, because 1209609 - 2⁵ = 1209577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1209629) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67192 + ... + 67209.

2^1209609 is an apocalyptic number.

It is an amenable number.

1209609 is a deficient number, since it is larger than the sum of its proper divisors (537617).

1209609 is a wasteful number, since it uses less digits than its factorization.

1209609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134407 (or 134404 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 1209609 is about 1099.8222583672. The cubic root of 1209609 is about 106.5487444656.

The spelling of 1209609 in words is "one million, two hundred nine thousand, six hundred nine".