307806649 has 2 divisors, whose sum is σ = 307806650. Its totient is φ = 307806648.

The previous prime is 307806637. The next prime is 307806679. The reversal of 307806649 is 946608703.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 286692624 + 21114025 = 16932^2 + 4595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-307806649 is a prime.

It is a super-4 number, since 4×307806649⁴ (a number of 35 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (307806679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153903324 + 153903325.

It is an arithmetic number, because the mean of its divisors is an integer number (153903325).

Almost surely, 2^307806649 is an apocalyptic number.

It is an amenable number.

307806649 is a deficient number, since it is larger than the sum of its proper divisors (1).

307806649 is an equidigital number, since it uses as much as digits as its factorization.

307806649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 307806649 is about 17544.4193121346. The cubic root of 307806649 is about 675.1899960813.

The spelling of 307806649 in words is "three hundred seven million, eight hundred six thousand, six hundred forty-nine".