240395209 has 2 divisors, whose sum is σ = 240395210. Its totient is φ = 240395208.

The previous prime is 240395161. The next prime is 240395231. The reversal of 240395209 is 902593042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185041609 + 55353600 = 13603^2 + 7440^2 .

It is a cyclic number.

It is not a de Polignac number, because 240395209 - 2²³ = 232006601 is a prime.

It is not a weakly prime, because it can be changed into another prime (240395299) 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, 120197604 + 120197605.

It is an arithmetic number, because the mean of its divisors is an integer number (120197605).

Almost surely, 2^240395209 is an apocalyptic number.

It is an amenable number.

240395209 is a deficient number, since it is larger than the sum of its proper divisors (1).

240395209 is an equidigital number, since it uses as much as digits as its factorization.

240395209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 240395209 is about 15504.6834537181. The cubic root of 240395209 is about 621.7874269722.

The spelling of 240395209 in words is "two hundred forty million, three hundred ninety-five thousand, two hundred nine".