240749809 has 8 divisors (see below), whose sum is σ = 252624960. Its totient is φ = 228992016.

The previous prime is 240749791. The next prime is 240749837. The reversal of 240749809 is 908947042.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 240749809 - 2⁷ = 240749681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (240749849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25122 + ... + 33355.

It is an arithmetic number, because the mean of its divisors is an integer number (31578120).

Almost surely, 2^240749809 is an apocalyptic number.

It is an amenable number.

240749809 is a deficient number, since it is larger than the sum of its proper divisors (11875151).

240749809 is a wasteful number, since it uses less digits than its factorization.

240749809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58679.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 240749809 is about 15516.1144942927. The cubic root of 240749809 is about 622.0930036384.

The spelling of 240749809 in words is "two hundred forty million, seven hundred forty-nine thousand, eight hundred nine".