9999947 has 8 divisors (see below), whose sum is σ = 10569360. Its totient is φ = 9434880.

The previous prime is 9999943. The next prime is 9999971. The reversal of 9999947 is 7499999.

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

It is a cyclic number.

It is not a de Polignac number, because 9999947 - 2² = 9999943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9999892 and 9999901.

It is not an unprimeable number, because it can be changed into a prime (9999943) 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 7 ways as a sum of consecutive naturals, for example, 4403 + ... + 6275.

It is an arithmetic number, because the mean of its divisors is an integer number (1321170).

Almost surely, 2^9999947 is an apocalyptic number.

9999947 is a deficient number, since it is larger than the sum of its proper divisors (569413).

9999947 is a wasteful number, since it uses less digits than its factorization.

9999947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2173.

The product of its digits is 1653372, while the sum is 56.

The square root of 9999947 is about 3162.2692801215. The cubic root of 9999947 is about 215.4430883857.

It can be divided in two parts, 999994 and 7, that added together give a palindrome (1000001).

The spelling of 9999947 in words is "nine million, nine hundred ninety-nine thousand, nine hundred forty-seven".