240839909 has 2 divisors, whose sum is σ = 240839910. Its totient is φ = 240839908.

The previous prime is 240839887. The next prime is 240839917. The reversal of 240839909 is 909938042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 234763684 + 6076225 = 15322^2 + 2465^2 .

It is a cyclic number.

It is not a de Polignac number, because 240839909 - 2²⁴ = 224062693 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 240839909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240835909) 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, 120419954 + 120419955.

It is an arithmetic number, because the mean of its divisors is an integer number (120419955).

Almost surely, 2^240839909 is an apocalyptic number.

It is an amenable number.

240839909 is a deficient number, since it is larger than the sum of its proper divisors (1).

240839909 is an equidigital number, since it uses as much as digits as its factorization.

240839909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 240839909 is about 15519.0176557667. The cubic root of 240839909 is about 622.1705995308.

The spelling of 240839909 in words is "two hundred forty million, eight hundred thirty-nine thousand, nine hundred nine".