8642909 has 6 divisors (see below), whose sum is σ = 9500190. Its totient is φ = 7857080.

The previous prime is 8642903. The next prime is 8642911. The reversal of 8642909 is 9092468.

8642909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 4937284 + 3705625 = 2222^2 + 1925^2 .

It is a de Polignac number, because none of the positive numbers 2^k-8642909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8642903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35594 + ... + 35835.

It is an arithmetic number, because the mean of its divisors is an integer number (1583365).

Almost surely, 2^8642909 is an apocalyptic number.

It is an amenable number.

8642909 is a deficient number, since it is larger than the sum of its proper divisors (857281).

8642909 is a wasteful number, since it uses less digits than its factorization.

8642909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71451 (or 71440 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 8642909 is about 2939.8824806444. The cubic root of 8642909 is about 205.2201402765.

It can be divided in two parts, 864 and 2909, that added together give a palindrome (3773).

The spelling of 8642909 in words is "eight million, six hundred forty-two thousand, nine hundred nine".