240805 has 8 divisors (see below), whose sum is σ = 306072. Its totient is φ = 181248.

The previous prime is 240797. The next prime is 240811. The reversal of 240805 is 508042.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 39204 + 201601 = 198^2 + 449^2 .

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 240805 - 2³ = 240797 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1332 + ... + 1501.

It is an arithmetic number, because the mean of its divisors is an integer number (38259).

2²⁴⁰⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

240805 is a deficient number, since it is larger than the sum of its proper divisors (65267).

240805 is a wasteful number, since it uses less digits than its factorization.

240805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2855.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 240805 is about 490.7188604486. The cubic root of 240805 is about 62.2140537510.

Adding to 240805 its reverse (508042), we get a palindrome (748847).

The spelling of 240805 in words is "two hundred forty thousand, eight hundred five".