8991956 has 12 divisors (see below), whose sum is σ = 16120020. Its totient is φ = 4386240.

The previous prime is 8991901. The next prime is 8991967. The reversal of 8991956 is 6591998.

It can be written as a sum of positive squares in 2 ways, for example, as 960400 + 8031556 = 980^2 + 2834^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 8991956.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27251 + ... + 27578.

It is an arithmetic number, because the mean of its divisors is an integer number (1343335).

Almost surely, 2^8991956 is an apocalyptic number.

It is an amenable number.

8991956 is a deficient number, since it is larger than the sum of its proper divisors (7128064).

8991956 is a wasteful number, since it uses less digits than its factorization.

8991956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54874 (or 54872 counting only the distinct ones).

The product of its digits is 174960, while the sum is 47.

The square root of 8991956 is about 2998.6590336349. The cubic root of 8991956 is about 207.9463927433.

The spelling of 8991956 in words is "eight million, nine hundred ninety-one thousand, nine hundred fifty-six".