240009 has 16 divisors (see below), whose sum is σ = 399360. Its totient is φ = 124560.

The previous prime is 240007. The next prime is 240011. The reversal of 240009 is 900042.

240009 = T₁₄ + T₁₅ + ... + T₁₁₂.

240009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (240007) and next prime (240011).

It is not a de Polignac number, because 240009 - 2¹ = 240007 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 240009.

It is not an unprimeable number, because it can be changed into a prime (240007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 289 + ... + 750.

It is an arithmetic number, because the mean of its divisors is an integer number (24960).

2²⁴⁰⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

240009 is a deficient number, since it is larger than the sum of its proper divisors (159351).

240009 is a wasteful number, since it uses less digits than its factorization.

240009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 240009 is about 489.9071340571. The cubic root of 240009 is about 62.1454269175.

It can be divided in two parts, 24000 and 9, that multiplied together give a cube (216000 = 60³).

The spelling of 240009 in words is "two hundred forty thousand, nine".