2409209 has 4 divisors (see below), whose sum is σ = 2628240. Its totient is φ = 2190180.

The previous prime is 2409203. The next prime is 2409217. The reversal of 2409209 is 9029042.

2409209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2409209 - 2⁴ = 2409193 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2409203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109499 + ... + 109520.

It is an arithmetic number, because the mean of its divisors is an integer number (657060).

2^2409209 is an apocalyptic number.

It is an amenable number.

2409209 is a deficient number, since it is larger than the sum of its proper divisors (219031).

2409209 is a wasteful number, since it uses less digits than its factorization.

2409209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219030.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 2409209 is about 1552.1626847724. The cubic root of 2409209 is about 134.0576161232.

It can be divided in two parts, 240 and 9209, that added together give a palindrome (9449).

The spelling of 2409209 in words is "two million, four hundred nine thousand, two hundred nine".