9991204 has 6 divisors (see below), whose sum is σ = 17484614. Its totient is φ = 4995600.

The previous prime is 9991199. The next prime is 9991211. The reversal of 9991204 is 4021999.

It can be written as a sum of positive squares in only one way, i.e., 8714304 + 1276900 = 2952^2 + 1130^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 9991204.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1248897 + ... + 1248904.

Almost surely, 2^9991204 is an apocalyptic number.

It is an amenable number.

9991204 is a deficient number, since it is larger than the sum of its proper divisors (7493410).

9991204 is a wasteful number, since it uses less digits than its factorization.

9991204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2497805 (or 2497803 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 9991204 is about 3160.8865844886. The cubic root of 9991204 is about 215.3802824482.

The spelling of 9991204 in words is "nine million, nine hundred ninety-one thousand, two hundred four".