306806693 has 2 divisors, whose sum is σ = 306806694. Its totient is φ = 306806692.

The previous prime is 306806681. The next prime is 306806707. The reversal of 306806693 is 396608603.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 304781764 + 2024929 = 17458^2 + 1423^2 .

It is a cyclic number.

It is not a de Polignac number, because 306806693 - 2¹² = 306802597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 306806693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (306806603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153403346 + 153403347.

It is an arithmetic number, because the mean of its divisors is an integer number (153403347).

Almost surely, 2^306806693 is an apocalyptic number.

It is an amenable number.

306806693 is a deficient number, since it is larger than the sum of its proper divisors (1).

306806693 is an equidigital number, since it uses as much as digits as its factorization.

306806693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 306806693 is about 17515.8982926940. The cubic root of 306806693 is about 674.4580509549.

It can be divided in two parts, 30680 and 6693, that added together give a palindrome (37373).

The spelling of 306806693 in words is "three hundred six million, eight hundred six thousand, six hundred ninety-three".