9998656 has 14 divisors (see below), whose sum is σ = 19841210. Its totient is φ = 4999296.

The previous prime is 9998641. The next prime is 9998689. The reversal of 9998656 is 6568999.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 5837056 + 4161600 = 2416^2 + 2040^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78051 + ... + 78178.

Almost surely, 2^9998656 is an apocalyptic number.

It is an amenable number.

9998656 is a deficient number, since it is larger than the sum of its proper divisors (9842554).

9998656 is a wasteful number, since it uses less digits than its factorization.

9998656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156241 (or 156231 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 52.

The square root of 9998656 is about 3162.0651479690. The cubic root of 9998656 is about 215.4338167033.

The spelling of 9998656 in words is "nine million, nine hundred ninety-eight thousand, six hundred fifty-six".