23404912009 has 4 divisors (see below), whose sum is σ = 23725527316. Its totient is φ = 23084296704.

The previous prime is 23404912007. The next prime is 23404912031. The reversal of 23404912009 is 90021940432.

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 11583786384 + 11821125625 = 107628^2 + 108725^2 .

It is a cyclic number.

It is not a de Polignac number, because 23404912009 - 2¹ = 23404912007 is a prime.

It is a super-2 number, since 2×23404912009² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23404912007) 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, 160307544 + ... + 160307689.

It is an arithmetic number, because the mean of its divisors is an integer number (5931381829).

Almost surely, 2^23404912009 is an apocalyptic number.

It is an amenable number.

23404912009 is a deficient number, since it is larger than the sum of its proper divisors (320615307).

23404912009 is an equidigital number, since it uses as much as digits as its factorization.

23404912009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320615306.

The product of its (nonzero) digits is 15552, while the sum is 34.

The spelling of 23404912009 in words is "twenty-three billion, four hundred four million, nine hundred twelve thousand, nine".