2008409 has 4 divisors (see below), whose sum is σ = 2162916. Its totient is φ = 1853904.

The previous prime is 2008403. The next prime is 2008421. The reversal of 2008409 is 9048002.

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 126025 + 1882384 = 355^2 + 1372^2 .

It is not a de Polignac number, because 2008409 - 2⁴ = 2008393 is a prime.

It is a super-2 number, since 2×2008409² = 8067413422562, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (2008403) 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, 77234 + ... + 77259.

It is an arithmetic number, because the mean of its divisors is an integer number (540729).

2^2008409 is an apocalyptic number.

It is an amenable number.

2008409 is a deficient number, since it is larger than the sum of its proper divisors (154507).

2008409 is a wasteful number, since it uses less digits than its factorization.

2008409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154506.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 2008409 is about 1417.1834743603. The cubic root of 2008409 is about 126.1684360271.

The spelling of 2008409 in words is "two million, eight thousand, four hundred nine".