8991992 has 8 divisors (see below), whose sum is σ = 16860000. Its totient is φ = 4495992.

The previous prime is 8991991. The next prime is 8992007. The reversal of 8991992 is 2991998.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8991991) 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 as a sum of consecutive naturals, namely, 561992 + ... + 562007.

It is an arithmetic number, because the mean of its divisors is an integer number (2107500).

Almost surely, 2^8991992 is an apocalyptic number.

It is an amenable number.

8991992 is a deficient number, since it is larger than the sum of its proper divisors (7868008).

8991992 is a wasteful number, since it uses less digits than its factorization.

8991992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124005 (or 1124001 counting only the distinct ones).

The product of its digits is 104976, while the sum is 47.

The square root of 8991992 is about 2998.6650363120. The cubic root of 8991992 is about 207.9466702528.

The spelling of 8991992 in words is "eight million, nine hundred ninety-one thousand, nine hundred ninety-two".