1209409 has 4 divisors (see below), whose sum is σ = 1262016. Its totient is φ = 1156804.

The previous prime is 1209379. The next prime is 1209427. The reversal of 1209409 is 9049021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1209409 - 2⁷ = 1209281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1209469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26269 + ... + 26314.

It is an arithmetic number, because the mean of its divisors is an integer number (315504).

2^1209409 is an apocalyptic number.

It is an amenable number.

1209409 is a deficient number, since it is larger than the sum of its proper divisors (52607).

1209409 is an equidigital number, since it uses as much as digits as its factorization.

1209409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52606.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1209409 is about 1099.7313308259. The cubic root of 1209409 is about 106.5428717901.

The spelling of 1209409 in words is "one million, two hundred nine thousand, four hundred nine".