30808009 has 4 divisors (see below), whose sum is σ = 30819204. Its totient is φ = 30796816.

The previous prime is 30808003. The next prime is 30808027. The reversal of 30808009 is 90080803.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90080803 = 863 ⋅104381.

It can be written as a sum of positive squares in 2 ways, for example, as 12446784 + 18361225 = 3528^2 + 4285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30808009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30808003) 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, 1719 + ... + 8035.

It is an arithmetic number, because the mean of its divisors is an integer number (7704801).

Almost surely, 2^30808009 is an apocalyptic number.

It is an amenable number.

30808009 is a deficient number, since it is larger than the sum of its proper divisors (11195).

30808009 is an equidigital number, since it uses as much as digits as its factorization.

30808009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11194.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 30808009 is about 5550.4962841173. The cubic root of 30808009 is about 313.4882091095.

The spelling of 30808009 in words is "thirty million, eight hundred eight thousand, nine".