9881947 has 8 divisors (see below), whose sum is σ = 10542096. Its totient is φ = 9230592.

The previous prime is 9881909. The next prime is 9881951. The reversal of 9881947 is 7491889.

It is a happy number.

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

It is not a de Polignac number, because 9881947 - 2⁷ = 9881819 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9881897 and 9881906.

It is not an unprimeable number, because it can be changed into a prime (9881987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208 + ... + 4450.

It is an arithmetic number, because the mean of its divisors is an integer number (1317762).

Almost surely, 2^9881947 is an apocalyptic number.

9881947 is a deficient number, since it is larger than the sum of its proper divisors (660149).

9881947 is a wasteful number, since it uses less digits than its factorization.

9881947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4397.

The product of its digits is 145152, while the sum is 46.

The square root of 9881947 is about 3143.5564254519. The cubic root of 9881947 is about 214.5923192098.

The spelling of 9881947 in words is "nine million, eight hundred eighty-one thousand, nine hundred forty-seven".