240001309 has 2 divisors, whose sum is σ = 240001310. Its totient is φ = 240001308.

The previous prime is 240001271. The next prime is 240001327. The reversal of 240001309 is 903100042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132940900 + 107060409 = 11530^2 + 10347^2 .

It is a cyclic number.

It is not a de Polignac number, because 240001309 - 2⁹ = 240000797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240001339) 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, 120000654 + 120000655.

It is an arithmetic number, because the mean of its divisors is an integer number (120000655).

Almost surely, 2^240001309 is an apocalyptic number.

It is an amenable number.

240001309 is a deficient number, since it is larger than the sum of its proper divisors (1).

240001309 is an equidigital number, since it uses as much as digits as its factorization.

240001309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 240001309 is about 15491.9756325654. The cubic root of 240001309 is about 621.4476310130.

The spelling of 240001309 in words is "two hundred forty million, one thousand, three hundred nine".