8218987 has 4 divisors (see below), whose sum is σ = 9393136. Its totient is φ = 7044840.

The previous prime is 8218961. The next prime is 8218993. The reversal of 8218987 is 7898128.

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

It is a cyclic number.

It is not a de Polignac number, because 8218987 - 2¹¹ = 8216939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8218087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 587064 + ... + 587077.

It is an arithmetic number, because the mean of its divisors is an integer number (2348284).

Almost surely, 2^8218987 is an apocalyptic number.

8218987 is a deficient number, since it is larger than the sum of its proper divisors (1174149).

8218987 is a wasteful number, since it uses less digits than its factorization.

8218987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174148.

The product of its digits is 64512, while the sum is 43.

The square root of 8218987 is about 2866.8775697612. The cubic root of 8218987 is about 201.8084892097.

The spelling of 8218987 in words is "eight million, two hundred eighteen thousand, nine hundred eighty-seven".