9878944249 has 4 divisors (see below), whose sum is σ = 9882993780. Its totient is φ = 9874894720.

The previous prime is 9878944193. The next prime is 9878944259. The reversal of 9878944249 is 9424498789.

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 5432721849 + 4446222400 = 73707^2 + 66680^2 .

It is a cyclic number.

It is not a de Polignac number, because 9878944249 - 2²⁵ = 9845389817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9878944259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2021104 + ... + 2025985.

It is an arithmetic number, because the mean of its divisors is an integer number (2470748445).

Almost surely, 2^9878944249 is an apocalyptic number.

It is an amenable number.

9878944249 is a deficient number, since it is larger than the sum of its proper divisors (4049531).

9878944249 is a wasteful number, since it uses less digits than its factorization.

9878944249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4049530.

The product of its digits is 41803776, while the sum is 64.

The square root of 9878944249 is about 99392.8782609700. The cubic root of 9878944249 is about 2145.7058150371.

The spelling of 9878944249 in words is "nine billion, eight hundred seventy-eight million, nine hundred forty-four thousand, two hundred forty-nine".