9847981 has 16 divisors (see below), whose sum is σ = 12253248. Its totient is φ = 7776000.

The previous prime is 9847969. The next prime is 9847991. The reversal of 9847981 is 1897489.

It is a happy number.

It is a 4-Lehmer number, since φ(9847981) divides (9847981-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 9847981 - 2⁵ = 9847949 is a prime.

It is a super-2 number, since 2×9847981² = 193965459552722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9847921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 406 + ... + 4456.

It is an arithmetic number, because the mean of its divisors is an integer number (765828).

Almost surely, 2^9847981 is an apocalyptic number.

It is an amenable number.

9847981 is a deficient number, since it is larger than the sum of its proper divisors (2405267).

9847981 is a wasteful number, since it uses less digits than its factorization.

9847981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4092.

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

The square root of 9847981 is about 3138.1492953650. The cubic root of 9847981 is about 214.3461730569.

The spelling of 9847981 in words is "nine million, eight hundred forty-seven thousand, nine hundred eighty-one".