305431212 has 12 divisors (see below), whose sum is σ = 712672856. Its totient is φ = 101810400.

The previous prime is 305431207. The next prime is 305431229. The reversal of 305431212 is 212134503.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 12726289 + ... + 12726312.

Almost surely, 2^305431212 is an apocalyptic number.

It is an amenable number.

305431212 is an abundant number, since it is smaller than the sum of its proper divisors (407241644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

305431212 is a wasteful number, since it uses less digits than its factorization.

305431212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25452608 (or 25452606 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 305431212 is about 17476.5903997319. The cubic root of 305431212 is about 673.4486270131.

Adding to 305431212 its reverse (212134503), we get a palindrome (517565715).

The spelling of 305431212 in words is "three hundred five million, four hundred thirty-one thousand, two hundred twelve".