240790309 has 2 divisors, whose sum is σ = 240790310. Its totient is φ = 240790308.

The previous prime is 240790307. The next prime is 240790331. The reversal of 240790309 is 903097042.

240790309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194686209 + 46104100 = 13953^2 + 6790^2 .

It is a cyclic number.

It is not a de Polignac number, because 240790309 - 2¹ = 240790307 is a prime.

Together with 240790307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240790307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120395154 + 120395155.

It is an arithmetic number, because the mean of its divisors is an integer number (120395155).

Almost surely, 2^240790309 is an apocalyptic number.

It is an amenable number.

240790309 is a deficient number, since it is larger than the sum of its proper divisors (1).

240790309 is an equidigital number, since it uses as much as digits as its factorization.

240790309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 240790309 is about 15517.4195341880. The cubic root of 240790309 is about 622.1278854300.

The spelling of 240790309 in words is "two hundred forty million, seven hundred ninety thousand, three hundred nine".