8442509 has 8 divisors (see below), whose sum is σ = 9016320. Its totient is φ = 7887600.

The previous prime is 8442481. The next prime is 8442521. The reversal of 8442509 is 9052448.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8442509 - 2²⁰ = 7393933 is a prime.

It is a super-3 number, since 3×8442509³ (a number of 22 digits) contains 333 as substring.

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 (8442559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3797 + ... + 5594.

It is an arithmetic number, because the mean of its divisors is an integer number (1127040).

Almost surely, 2^8442509 is an apocalyptic number.

It is an amenable number.

8442509 is a deficient number, since it is larger than the sum of its proper divisors (573811).

8442509 is a wasteful number, since it uses less digits than its factorization.

8442509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9451.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 8442509 is about 2905.5995938876. The cubic root of 8442509 is about 203.6215992540.

The spelling of 8442509 in words is "eight million, four hundred forty-two thousand, five hundred nine".