30005309 has 2 divisors, whose sum is σ = 30005310. Its totient is φ = 30005308.

The previous prime is 30005299. The next prime is 30005321. The reversal of 30005309 is 90350003.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19829209 + 10176100 = 4453^2 + 3190^2 .

It is a cyclic number.

It is not a de Polignac number, because 30005309 - 2¹⁶ = 29939773 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30005359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15002654 + 15002655.

It is an arithmetic number, because the mean of its divisors is an integer number (15002655).

Almost surely, 2^30005309 is an apocalyptic number.

It is an amenable number.

30005309 is a deficient number, since it is larger than the sum of its proper divisors (1).

30005309 is an equidigital number, since it uses as much as digits as its factorization.

30005309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 405, while the sum is 20.

The square root of 30005309 is about 5477.7101967884. The cubic root of 30005309 is about 310.7415787336.

The spelling of 30005309 in words is "thirty million, five thousand, three hundred nine".