240696809 has 2 divisors, whose sum is σ = 240696810. Its totient is φ = 240696808.

The previous prime is 240696793. The next prime is 240696847. The reversal of 240696809 is 908696042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153834409 + 86862400 = 12403^2 + 9320^2 .

It is a cyclic number.

It is not a de Polignac number, because 240696809 - 2⁴ = 240696793 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 240696809.

It is not a weakly prime, because it can be changed into another prime (240696409) 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 as a sum of consecutive naturals, namely, 120348404 + 120348405.

It is an arithmetic number, because the mean of its divisors is an integer number (120348405).

Almost surely, 2^240696809 is an apocalyptic number.

It is an amenable number.

240696809 is a deficient number, since it is larger than the sum of its proper divisors (1).

240696809 is an equidigital number, since it uses as much as digits as its factorization.

240696809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 240696809 is about 15514.4064984775. The cubic root of 240696809 is about 622.0473499518.

The spelling of 240696809 in words is "two hundred forty million, six hundred ninety-six thousand, eight hundred nine".