306642213 has 32 divisors (see below), whose sum is σ = 462758400. Its totient is φ = 200648448.

The previous prime is 306642211. The next prime is 306642223. The reversal of 306642213 is 312246603.

306642213 is a `hidden beast` number, since 3 + 0 + 6 + 642 + 2 + 13 = 666.

It is not a de Polignac number, because 306642213 - 2¹ = 306642211 is a prime.

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

It is a congruent number.

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 in 31 ways as a sum of consecutive naturals, for example, 496681 + ... + 497297.

It is an arithmetic number, because the mean of its divisors is an integer number (14461200).

Almost surely, 2^306642213 is an apocalyptic number.

It is an amenable number.

306642213 is a deficient number, since it is larger than the sum of its proper divisors (156116187).

306642213 is a wasteful number, since it uses less digits than its factorization.

306642213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938 (or 932 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 306642213 is about 17511.2025001140. The cubic root of 306642213 is about 674.3375030737.

Adding to 306642213 its reverse (312246603), we get a palindrome (618888816).

The spelling of 306642213 in words is "three hundred six million, six hundred forty-two thousand, two hundred thirteen".