240905 has 8 divisors (see below), whose sum is σ = 330432. Its totient is φ = 165168.

The previous prime is 240899. The next prime is 240913. The reversal of 240905 is 509042.

240905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 240905 - 2⁶ = 240841 is a prime.

It is an Ulam number.

It is a Duffinian 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, 3407 + ... + 3476.

It is an arithmetic number, because the mean of its divisors is an integer number (41304).

2²⁴⁰⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

240905 is a deficient number, since it is larger than the sum of its proper divisors (89527).

240905 is an equidigital number, since it uses as much as digits as its factorization.

240905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6895.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 240905 is about 490.8207412080. The cubic root of 240905 is about 62.2226645141. Note that the first 3 decimals are identical.

Adding to 240905 its reverse (509042), we get a palindrome (749947).

It can be divided in two parts, 2 and 40905, that multiplied together give a triangular number (81810 = T₄₀₄).

The spelling of 240905 in words is "two hundred forty thousand, nine hundred five".