2604409 has 4 divisors (see below), whose sum is σ = 2618980. Its totient is φ = 2589840.

The previous prime is 2604401. The next prime is 2604431. The reversal of 2604409 is 9044062.

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 278784 + 2325625 = 528^2 + 1525^2 .

It is a cyclic number.

It is not a de Polignac number, because 2604409 - 2³ = 2604401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2604401) 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, 7014 + ... + 7375.

It is an arithmetic number, because the mean of its divisors is an integer number (654745).

2^2604409 is an apocalyptic number.

It is an amenable number.

2604409 is a deficient number, since it is larger than the sum of its proper divisors (14571).

2604409 is a wasteful number, since it uses less digits than its factorization.

2604409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14570.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 2604409 is about 1613.8181434102. The cubic root of 2604409 is about 137.5845694624.

The spelling of 2604409 in words is "two million, six hundred four thousand, four hundred nine".