8742309 has 4 divisors (see below), whose sum is σ = 11656416. Its totient is φ = 5828204.

The previous prime is 8742263. The next prime is 8742313. The reversal of 8742309 is 9032478.

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 8742309 - 2⁹ = 8741797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8742309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8742359) 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, 1457049 + ... + 1457054.

It is an arithmetic number, because the mean of its divisors is an integer number (2914104).

Almost surely, 2^8742309 is an apocalyptic number.

It is an amenable number.

8742309 is a deficient number, since it is larger than the sum of its proper divisors (2914107).

8742309 is a wasteful number, since it uses less digits than its factorization.

8742309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2914106.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 8742309 is about 2956.7395894803. The cubic root of 8742309 is about 206.0038724254.

The spelling of 8742309 in words is "eight million, seven hundred forty-two thousand, three hundred nine".