9966247 has 4 divisors (see below), whose sum is σ = 9988056. Its totient is φ = 9944440.

The previous prime is 9966223. The next prime is 9966251. The reversal of 9966247 is 7426699.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9966247 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 (9966217) 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, 10204 + ... + 11137.

It is an arithmetic number, because the mean of its divisors is an integer number (2497014).

Almost surely, 2^9966247 is an apocalyptic number.

9966247 is a deficient number, since it is larger than the sum of its proper divisors (21809).

9966247 is a wasteful number, since it uses less digits than its factorization.

9966247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21808.

The product of its digits is 163296, while the sum is 43.

The square root of 9966247 is about 3156.9363313187. The cubic root of 9966247 is about 215.2008003245.

The spelling of 9966247 in words is "nine million, nine hundred sixty-six thousand, two hundred forty-seven".