240406909 has 4 divisors (see below), whose sum is σ = 240460000. Its totient is φ = 240353820.

The previous prime is 240406861. The next prime is 240406919. The reversal of 240406909 is 909604042.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 909604042 = 2 ⋅454802021.

It is a cyclic number.

It is not a de Polignac number, because 240406909 - 2¹¹ = 240404861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240406919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19047 + ... + 29044.

It is an arithmetic number, because the mean of its divisors is an integer number (60115000).

Almost surely, 2^240406909 is an apocalyptic number.

It is an amenable number.

240406909 is a deficient number, since it is larger than the sum of its proper divisors (53091).

240406909 is an equidigital number, since it uses as much as digits as its factorization.

240406909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53090.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 240406909 is about 15505.0607544763. The cubic root of 240406909 is about 621.7975142432.

The spelling of 240406909 in words is "two hundred forty million, four hundred six thousand, nine hundred nine".