2405749209 has 4 divisors (see below), whose sum is σ = 3207665616. Its totient is φ = 1603832804.

The previous prime is 2405749153. The next prime is 2405749217. The reversal of 2405749209 is 9029475042.

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 2405749209 - 2⁸ = 2405748953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2405749289) 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, 400958199 + ... + 400958204.

It is an arithmetic number, because the mean of its divisors is an integer number (801916404).

Almost surely, 2^2405749209 is an apocalyptic number.

It is an amenable number.

2405749209 is a deficient number, since it is larger than the sum of its proper divisors (801916407).

2405749209 is an equidigital number, since it uses as much as digits as its factorization.

2405749209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801916406.

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 2405749209 is about 49048.4373757207. The cubic root of 2405749209 is about 1339.9341337269.

The spelling of 2405749209 in words is "two billion, four hundred five million, seven hundred forty-nine thousand, two hundred nine".