9857879447 has 4 divisors (see below), whose sum is σ = 10616177880. Its totient is φ = 9099581016.

The previous prime is 9857879429. The next prime is 9857879461. The reversal of 9857879447 is 7449787589.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7449787589 = 4729 ⋅1575341.

It is a cyclic number.

It is not a de Polignac number, because 9857879447 - 2¹⁰ = 9857878423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9857879417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 379149197 + ... + 379149222.

It is an arithmetic number, because the mean of its divisors is an integer number (2654044470).

Almost surely, 2^9857879447 is an apocalyptic number.

9857879447 is a deficient number, since it is larger than the sum of its proper divisors (758298433).

9857879447 is a wasteful number, since it uses less digits than its factorization.

9857879447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758298432.

The product of its digits is 142248960, while the sum is 68.

The square root of 9857879447 is about 99286.8543514196. The cubic root of 9857879447 is about 2144.1796387287.

The spelling of 9857879447 in words is "nine billion, eight hundred fifty-seven million, eight hundred seventy-nine thousand, four hundred forty-seven".