306642212 has 6 divisors (see below), whose sum is σ = 536623878. Its totient is φ = 153321104.

The previous prime is 306642211. The next prime is 306642223. The reversal of 306642212 is 212246603.

It can be written as a sum of positive squares in only one way, i.e., 306040036 + 602176 = 17494^2 + 776^2 .

It is not an unprimeable number, because it can be changed into a prime (306642211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38330273 + ... + 38330280.

It is an arithmetic number, because the mean of its divisors is an integer number (89437313).

Almost surely, 2^306642212 is an apocalyptic number.

It is an amenable number.

306642212 is a deficient number, since it is larger than the sum of its proper divisors (229981666).

306642212 is a wasteful number, since it uses less digits than its factorization.

306642212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76660557 (or 76660555 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 306642212 is about 17511.2024715609. The cubic root of 306642212 is about 674.3375023407.

Adding to 306642212 its reverse (212246603), we get a palindrome (518888815).

The spelling of 306642212 in words is "three hundred six million, six hundred forty-two thousand, two hundred twelve".