8421089 has 4 divisors (see below), whose sum is σ = 8648724. Its totient is φ = 8193456.

The previous prime is 8421079. The next prime is 8421143. The reversal of 8421089 is 9801248.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4389025 + 4032064 = 2095^2 + 2008^2 .

It is a cyclic number.

It is not a de Polignac number, because 8421089 - 2⁸ = 8420833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8421079) 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, 113762 + ... + 113835.

It is an arithmetic number, because the mean of its divisors is an integer number (2162181).

Almost surely, 2^8421089 is an apocalyptic number.

It is an amenable number.

8421089 is a deficient number, since it is larger than the sum of its proper divisors (227635).

8421089 is a wasteful number, since it uses less digits than its factorization.

8421089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227634.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 8421089 is about 2901.9112667344. The cubic root of 8421089 is about 203.4492465195.

The spelling of 8421089 in words is "eight million, four hundred twenty-one thousand, eighty-nine".