9991244 has 6 divisors (see below), whose sum is σ = 17484684. Its totient is φ = 4995620.

The previous prime is 9991211. The next prime is 9991259. The reversal of 9991244 is 4421999.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 9991198 and 9991207.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1248902 + ... + 1248909.

It is an arithmetic number, because the mean of its divisors is an integer number (2914114).

Almost surely, 2^9991244 is an apocalyptic number.

It is an amenable number.

9991244 is a deficient number, since it is larger than the sum of its proper divisors (7493440).

9991244 is a wasteful number, since it uses less digits than its factorization.

9991244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2497815 (or 2497813 counting only the distinct ones).

The product of its digits is 23328, while the sum is 38.

The square root of 9991244 is about 3160.8929118210. The cubic root of 9991244 is about 215.3805698743.

The spelling of 9991244 in words is "nine million, nine hundred ninety-one thousand, two hundred forty-four".