140342309 has 2 divisors, whose sum is σ = 140342310. Its totient is φ = 140342308.

The previous prime is 140342299. The next prime is 140342333. The reversal of 140342309 is 903243041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71402500 + 68939809 = 8450^2 + 8303^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140342309 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 (140342399) 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, 70171154 + 70171155.

It is an arithmetic number, because the mean of its divisors is an integer number (70171155).

Almost surely, 2^140342309 is an apocalyptic number.

It is an amenable number.

140342309 is a deficient number, since it is larger than the sum of its proper divisors (1).

140342309 is an equidigital number, since it uses as much as digits as its factorization.

140342309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 140342309 is about 11846.6159302984. The cubic root of 140342309 is about 519.6722651324.

The spelling of 140342309 in words is "one hundred forty million, three hundred forty-two thousand, three hundred nine".