8887991 has 16 divisors (see below), whose sum is σ = 11324160. Its totient is φ = 6791040.

The previous prime is 8887981. The next prime is 8888003. The reversal of 8887991 is 1997888.

It is a happy number.

8887991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 8887991 - 2¹⁰ = 8886967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8887961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 296 + ... + 4226.

It is an arithmetic number, because the mean of its divisors is an integer number (707760).

Almost surely, 2^8887991 is an apocalyptic number.

8887991 is a deficient number, since it is larger than the sum of its proper divisors (2436169).

8887991 is a wasteful number, since it uses less digits than its factorization.

8887991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3974.

The product of its digits is 290304, while the sum is 50.

The square root of 8887991 is about 2981.2733856525. The cubic root of 8887991 is about 207.1418586215.

The spelling of 8887991 in words is "eight million, eight hundred eighty-seven thousand, nine hundred ninety-one".