306640243 has 16 divisors (see below), whose sum is σ = 377899200. Its totient is φ = 242297856.

The previous prime is 306640241. The next prime is 306640249. The reversal of 306640243 is 342046603.

It is a cyclic number.

It is not a de Polignac number, because 306640243 - 2¹ = 306640241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (306640241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87183 + ... + 90631.

It is an arithmetic number, because the mean of its divisors is an integer number (23618700).

Almost surely, 2^306640243 is an apocalyptic number.

306640243 is a deficient number, since it is larger than the sum of its proper divisors (71258957).

306640243 is a wasteful number, since it uses less digits than its factorization.

306640243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4446.

The product of its (nonzero) digits is 10368, while the sum is 28.

The square root of 306640243 is about 17511.1462503173. The cubic root of 306640243 is about 674.3360589936.

Adding to 306640243 its reverse (342046603), we get a palindrome (648686846).

The spelling of 306640243 in words is "three hundred six million, six hundred forty thousand, two hundred forty-three".