9990247 has 4 divisors (see below), whose sum is σ = 10006200. Its totient is φ = 9974296.

The previous prime is 9990221. The next prime is 9990251. The reversal of 9990247 is 7420999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7420999 = 659 ⋅11261.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9990247 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9990047) 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 3 ways as a sum of consecutive naturals, for example, 6997 + ... + 8302.

It is an arithmetic number, because the mean of its divisors is an integer number (2501550).

Almost surely, 2^9990247 is an apocalyptic number.

9990247 is a deficient number, since it is larger than the sum of its proper divisors (15953).

9990247 is a wasteful number, since it uses less digits than its factorization.

9990247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15952.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 9990247 is about 3160.7351992851. The cubic root of 9990247 is about 215.3734055488.

The spelling of 9990247 in words is "nine million, nine hundred ninety thousand, two hundred forty-seven".