240689 has 4 divisors (see below), whose sum is σ = 241956. Its totient is φ = 239424.

The previous prime is 240677. The next prime is 240701. The reversal of 240689 is 986042.

240689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 986042 = 2 ⋅493021.

It is an interprime number because it is at equal distance from previous prime (240677) and next prime (240701).

It can be written as a sum of positive squares in 2 ways, for example, as 153664 + 87025 = 392^2 + 295^2 .

It is a cyclic number.

It is not a de Polignac number, because 240689 - 2⁸ = 240433 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (240659) 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, 284 + ... + 749.

It is an arithmetic number, because the mean of its divisors is an integer number (60489).

2²⁴⁰⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

240689 is a deficient number, since it is larger than the sum of its proper divisors (1267).

240689 is a wasteful number, since it uses less digits than its factorization.

240689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 240689 is about 490.6006522621. The cubic root of 240689 is about 62.2040622788.

It can be divided in two parts, 24068 and 9, that multiplied together give a palindrome (216612).

The spelling of 240689 in words is "two hundred forty thousand, six hundred eighty-nine".