306421685 has 16 divisors (see below), whose sum is σ = 402764400. Its totient is φ = 222759936.

The previous prime is 306421681. The next prime is 306421693. The reversal of 306421685 is 586124603.

It can be written as a sum of positive squares in 8 ways, for example, as 2337841 + 304083844 = 1529^2 + 17438^2 .

It is a cyclic number.

It is not a de Polignac number, because 306421685 - 2² = 306421681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306421681) 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, 59690 + ... + 64619.

It is an arithmetic number, because the mean of its divisors is an integer number (25172775).

Almost surely, 2^306421685 is an apocalyptic number.

It is an amenable number.

306421685 is a deficient number, since it is larger than the sum of its proper divisors (96342715).

306421685 is a wasteful number, since it uses less digits than its factorization.

306421685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124360.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 306421685 is about 17504.9045984261. The cubic root of 306421685 is about 674.1758097841.

The spelling of 306421685 in words is "three hundred six million, four hundred twenty-one thousand, six hundred eighty-five".