9909872405 has 8 divisors (see below), whose sum is σ = 12181892184. Its totient is φ = 7734534400.

The previous prime is 9909872387. The next prime is 9909872419. The reversal of 9909872405 is 5042789099.

9909872405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1308051889 + 8601820516 = 36167^2 + 92746^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9909872405 - 2¹⁸ = 9909610261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 24170216 + ... + 24170625.

It is an arithmetic number, because the mean of its divisors is an integer number (1522736523).

Almost surely, 2^9909872405 is an apocalyptic number.

It is an amenable number.

9909872405 is a deficient number, since it is larger than the sum of its proper divisors (2272019779).

9909872405 is a wasteful number, since it uses less digits than its factorization.

9909872405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48340887.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The square root of 9909872405 is about 99548.3420504832. The cubic root of 9909872405 is about 2147.9426799104.

The spelling of 9909872405 in words is "nine billion, nine hundred nine million, eight hundred seventy-two thousand, four hundred five".