8555989 has 4 divisors (see below), whose sum is σ = 9214156. Its totient is φ = 7897824.

The previous prime is 8555959. The next prime is 8555999. The reversal of 8555989 is 9895558.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9895558 = 2 ⋅4947779.

It can be written as a sum of positive squares in 2 ways, for example, as 2053489 + 6502500 = 1433^2 + 2550^2 .

It is a cyclic number.

It is not a de Polignac number, because 8555989 - 2⁷ = 8555861 is a prime.

It is a Duffinian number.

8555989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8555929) 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, 329064 + ... + 329089.

It is an arithmetic number, because the mean of its divisors is an integer number (2303539).

Almost surely, 2^8555989 is an apocalyptic number.

It is an amenable number.

8555989 is a deficient number, since it is larger than the sum of its proper divisors (658167).

8555989 is a wasteful number, since it uses less digits than its factorization.

8555989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658166.

The product of its digits is 648000, while the sum is 49.

The square root of 8555989 is about 2925.0622215604. The cubic root of 8555989 is about 204.5298685258.

The spelling of 8555989 in words is "eight million, five hundred fifty-five thousand, nine hundred eighty-nine".