30120205 has 4 divisors (see below), whose sum is σ = 36144252. Its totient is φ = 24096160.

The previous prime is 30120203. The next prime is 30120217. The reversal of 30120205 is 50202103.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13498276 + 16621929 = 3674^2 + 4077^2 .

It is not a de Polignac number, because 30120205 - 2¹ = 30120203 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30120203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3012016 + ... + 3012025.

It is an arithmetic number, because the mean of its divisors is an integer number (9036063).

Almost surely, 2^30120205 is an apocalyptic number.

It is an amenable number.

30120205 is a deficient number, since it is larger than the sum of its proper divisors (6024047).

30120205 is an equidigital number, since it uses as much as digits as its factorization.

30120205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6024046.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 30120205 is about 5488.1877701114. The cubic root of 30120205 is about 311.1377029661.

Adding to 30120205 its reverse (50202103), we get a palindrome (80322308).

The spelling of 30120205 in words is "thirty million, one hundred twenty thousand, two hundred five".