9947731 has 4 divisors (see below), whose sum is σ = 9958600. Its totient is φ = 9936864.

The previous prime is 9947723. The next prime is 9947741. The reversal of 9947731 is 1377499.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 9947731 - 2³ = 9947723 is a prime.

It is a super-2 number, since 2×9947731² = 197914704096722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9947741) 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 3 ways as a sum of consecutive naturals, for example, 3921 + ... + 5938.

It is an arithmetic number, because the mean of its divisors is an integer number (2489650).

Almost surely, 2^9947731 is an apocalyptic number.

9947731 is a deficient number, since it is larger than the sum of its proper divisors (10869).

9947731 is a wasteful number, since it uses less digits than its factorization.

9947731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10868.

The product of its digits is 47628, while the sum is 40.

The square root of 9947731 is about 3154.0023779319. The cubic root of 9947731 is about 215.0674459392.

The spelling of 9947731 in words is "nine million, nine hundred forty-seven thousand, seven hundred thirty-one".