240040909 has 2 divisors, whose sum is σ = 240040910. Its totient is φ = 240040908.

The previous prime is 240040877. The next prime is 240040919. The reversal of 240040909 is 909040042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196084009 + 43956900 = 14003^2 + 6630^2 .

It is a cyclic number.

It is not a de Polignac number, because 240040909 - 2⁵ = 240040877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240040919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120020454 + 120020455.

It is an arithmetic number, because the mean of its divisors is an integer number (120020455).

Almost surely, 2^240040909 is an apocalyptic number.

It is an amenable number.

240040909 is a deficient number, since it is larger than the sum of its proper divisors (1).

240040909 is an equidigital number, since it uses as much as digits as its factorization.

240040909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 240040909 is about 15493.2536608680. The cubic root of 240040909 is about 621.4818085666.

The spelling of 240040909 in words is "two hundred forty million, forty thousand, nine hundred nine".