306640853 has 4 divisors (see below), whose sum is σ = 319973088. Its totient is φ = 293308620.

The previous prime is 306640837. The next prime is 306640889. The reversal of 306640853 is 358046603.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 306640853 - 2⁴ = 306640837 is a prime.

It is a super-2 number, since 2×306640853² = 188057225457135218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306640813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6666083 + ... + 6666128.

It is an arithmetic number, because the mean of its divisors is an integer number (79993272).

Almost surely, 2^306640853 is an apocalyptic number.

It is an amenable number.

306640853 is a deficient number, since it is larger than the sum of its proper divisors (13332235).

306640853 is a wasteful number, since it uses less digits than its factorization.

306640853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13332234.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 306640853 is about 17511.1636677863. The cubic root of 306640853 is about 674.3365061460.

The spelling of 306640853 in words is "three hundred six million, six hundred forty thousand, eight hundred fifty-three".