8642009 has 4 divisors (see below), whose sum is σ = 8726016. Its totient is φ = 8558004.

The previous prime is 8642003. The next prime is 8642027. The reversal of 8642009 is 9002468.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8642009 - 2²⁰ = 7593433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8642003) 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, 41849 + ... + 42054.

It is an arithmetic number, because the mean of its divisors is an integer number (2181504).

Almost surely, 2^8642009 is an apocalyptic number.

It is an amenable number.

8642009 is a deficient number, since it is larger than the sum of its proper divisors (84007).

8642009 is a wasteful number, since it uses less digits than its factorization.

8642009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84006.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 8642009 is about 2939.7294093164. The cubic root of 8642009 is about 205.2130167283.

The spelling of 8642009 in words is "eight million, six hundred forty-two thousand, nine".