240669809 has 2 divisors, whose sum is σ = 240669810. Its totient is φ = 240669808.

The previous prime is 240669797. The next prime is 240669823. The reversal of 240669809 is 908966042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220671025 + 19998784 = 14855^2 + 4472^2 .

It is a cyclic number.

It is not a de Polignac number, because 240669809 - 2¹² = 240665713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 240669809.

It is not a weakly prime, because it can be changed into another prime (240669859) 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, 120334904 + 120334905.

It is an arithmetic number, because the mean of its divisors is an integer number (120334905).

Almost surely, 2^240669809 is an apocalyptic number.

It is an amenable number.

240669809 is a deficient number, since it is larger than the sum of its proper divisors (1).

240669809 is an equidigital number, since it uses as much as digits as its factorization.

240669809 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 240669809 is about 15513.5363151024. The cubic root of 240669809 is about 622.0240898367.

The spelling of 240669809 in words is "two hundred forty million, six hundred sixty-nine thousand, eight hundred nine".