240015409 has 2 divisors, whose sum is σ = 240015410. Its totient is φ = 240015408.

The previous prime is 240015407. The next prime is 240015427. The reversal of 240015409 is 904510042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196784784 + 43230625 = 14028^2 + 6575^2 .

It is a cyclic number.

It is not a de Polignac number, because 240015409 - 2¹ = 240015407 is a prime.

Together with 240015407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (240015403) 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, 120007704 + 120007705.

It is an arithmetic number, because the mean of its divisors is an integer number (120007705).

Almost surely, 2^240015409 is an apocalyptic number.

It is an amenable number.

240015409 is a deficient number, since it is larger than the sum of its proper divisors (1).

240015409 is an equidigital number, since it uses as much as digits as its factorization.

240015409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 240015409 is about 15492.4307001839. The cubic root of 240015409 is about 621.4598007244.

The spelling of 240015409 in words is "two hundred forty million, fifteen thousand, four hundred nine".