240440209 has 2 divisors, whose sum is σ = 240440210. Its totient is φ = 240440208.

The previous prime is 240440191. The next prime is 240440227. The reversal of 240440209 is 902044042.

240440209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (240440191) and next prime (240440227).

It can be written as a sum of positive squares in only one way, i.e., 149523984 + 90916225 = 12228^2 + 9535^2 .

It is a cyclic number.

It is not a de Polignac number, because 240440209 - 2⁵ = 240440177 is a prime.

It is a super-2 number, since 2×240440209² = 115622988207927362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (240440279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120220104 + 120220105.

It is an arithmetic number, because the mean of its divisors is an integer number (120220105).

Almost surely, 2^240440209 is an apocalyptic number.

It is an amenable number.

240440209 is a deficient number, since it is larger than the sum of its proper divisors (1).

240440209 is an equidigital number, since it uses as much as digits as its factorization.

240440209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 240440209 is about 15506.1345602313. The cubic root of 240440209 is about 621.8262223772.

The spelling of 240440209 in words is "two hundred forty million, four hundred forty thousand, two hundred nine".