30309 has 4 divisors (see below), whose sum is σ = 40416. Its totient is φ = 20204.

The previous prime is 30307. The next prime is 30313. The reversal of 30309 is 90303.

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 30309 - 2¹ = 30307 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between odd and even.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30307) 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, 5049 + ... + 5054.

It is an arithmetic number, because the mean of its divisors is an integer number (10104).

2³⁰³⁰⁹ is an apocalyptic number.

It is an amenable number.

30309 is a deficient number, since it is larger than the sum of its proper divisors (10107).

30309 is a wasteful number, since it uses less digits than its factorization.

30309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10106.

The product of its (nonzero) digits is 81, while the sum is 15.

The square root of 30309 is about 174.0948017604. The cubic root of 30309 is about 31.1786425169.

The spelling of 30309 in words is "thirty thousand, three hundred nine".