8005649 has 2 divisors, whose sum is σ = 8005650. Its totient is φ = 8005648.

The previous prime is 8005643. The next prime is 8005663. The reversal of 8005649 is 9465008.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7840000 + 165649 = 2800^2 + 407^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8005649 is a prime.

It is a super-2 number, since 2×8005649² = 128180831822402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8005643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4002824 + 4002825.

It is an arithmetic number, because the mean of its divisors is an integer number (4002825).

Almost surely, 2^8005649 is an apocalyptic number.

It is an amenable number.

8005649 is a deficient number, since it is larger than the sum of its proper divisors (1).

8005649 is an equidigital number, since it uses as much as digits as its factorization.

8005649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 8005649 is about 2829.4255600740. The cubic root of 8005649 is about 200.0470639241.

The spelling of 8005649 in words is "eight million, five thousand, six hundred forty-nine".