240242309 has 2 divisors, whose sum is σ = 240242310. Its totient is φ = 240242308.

The previous prime is 240242263. The next prime is 240242323. The reversal of 240242309 is 903242042.

240242309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131102500 + 109139809 = 11450^2 + 10447^2 .

It is a cyclic number.

It is not a de Polignac number, because 240242309 - 2¹⁶ = 240176773 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240242399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120121154 + 120121155.

It is an arithmetic number, because the mean of its divisors is an integer number (120121155).

Almost surely, 2^240242309 is an apocalyptic number.

It is an amenable number.

240242309 is a deficient number, since it is larger than the sum of its proper divisors (1).

240242309 is an equidigital number, since it uses as much as digits as its factorization.

240242309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 240242309 is about 15499.7519012402. The cubic root of 240242309 is about 621.6555726237.

The spelling of 240242309 in words is "two hundred forty million, two hundred forty-two thousand, three hundred nine".