2004402409 has 4 divisors (see below), whose sum is σ = 2009776516. Its totient is φ = 1999028304.

The previous prime is 2004402377. The next prime is 2004402451. The reversal of 2004402409 is 9042044002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9042044002 = 2 ⋅4521022001.

It can be written as a sum of positive squares in 2 ways, for example, as 1562225625 + 442176784 = 39525^2 + 21028^2 .

It is a cyclic number.

It is not a de Polignac number, because 2004402409 - 2⁵ = 2004402377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2004402709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2686494 + ... + 2687239.

It is an arithmetic number, because the mean of its divisors is an integer number (502444129).

Almost surely, 2^2004402409 is an apocalyptic number.

It is an amenable number.

2004402409 is a deficient number, since it is larger than the sum of its proper divisors (5374107).

2004402409 is an equidigital number, since it uses as much as digits as its factorization.

2004402409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5374106.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 2004402409 is about 44770.5529226522. The cubic root of 2004402409 is about 1260.8448203850.

The spelling of 2004402409 in words is "two billion, four million, four hundred two thousand, four hundred nine".