30409209 has 32 divisors (see below), whose sum is σ = 48263040. Its totient is φ = 18855936.

The previous prime is 30409193. The next prime is 30409217. The reversal of 30409209 is 90290403.

It is not a de Polignac number, because 30409209 - 2⁴ = 30409193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (30409219) 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 31 ways as a sum of consecutive naturals, for example, 44182 + ... + 44864.

It is an arithmetic number, because the mean of its divisors is an integer number (1508220).

Almost surely, 2^30409209 is an apocalyptic number.

It is an amenable number.

30409209 is a deficient number, since it is larger than the sum of its proper divisors (17853831).

30409209 is a wasteful number, since it uses less digits than its factorization.

30409209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806 (or 800 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 30409209 is about 5514.4545514493. The cubic root of 30409209 is about 312.1296613444.

The spelling of 30409209 in words is "thirty million, four hundred nine thousand, two hundred nine".