305205145 has 16 divisors (see below), whose sum is σ = 419015808. Its totient is φ = 209059200.

The previous prime is 305205127. The next prime is 305205149. The reversal of 305205145 is 541502503.

It is not a de Polignac number, because 305205145 - 2⁹ = 305204633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (305205149) 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 15 ways as a sum of consecutive naturals, for example, 32637 + ... + 40933.

It is an arithmetic number, because the mean of its divisors is an integer number (26188488).

Almost surely, 2^305205145 is an apocalyptic number.

305205145 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

305205145 is a deficient number, since it is larger than the sum of its proper divisors (113810663).

305205145 is a wasteful number, since it uses less digits than its factorization.

305205145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9360.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 305205145 is about 17470.1214935672. The cubic root of 305205145 is about 673.2824334679.

Adding to 305205145 its reverse (541502503), we get a palindrome (846707648).

The spelling of 305205145 in words is "three hundred five million, two hundred five thousand, one hundred forty-five".