8987891 has 4 divisors (see below), whose sum is σ = 9804984. Its totient is φ = 8170800.

The previous prime is 8987851. The next prime is 8987911. The reversal of 8987891 is 1987898.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 8987891 - 2²² = 4793587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8987851) 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 in 3 ways as a sum of consecutive naturals, for example, 408530 + ... + 408551.

It is an arithmetic number, because the mean of its divisors is an integer number (2451246).

Almost surely, 2^8987891 is an apocalyptic number.

8987891 is a deficient number, since it is larger than the sum of its proper divisors (817093).

8987891 is a wasteful number, since it uses less digits than its factorization.

8987891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817092.

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

The square root of 8987891 is about 2997.9811540435. The cubic root of 8987891 is about 207.9150525285.

The spelling of 8987891 in words is "eight million, nine hundred eighty-seven thousand, eight hundred ninety-one".