240523 has 4 divisors (see below), whose sum is σ = 244528. Its totient is φ = 236520.

The previous prime is 240517. The next prime is 240551. The reversal of 240523 is 325042.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 240523 - 2⁵ = 240491 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 240497 and 240506.

It is not an unprimeable number, because it can be changed into a prime (240503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1911 + ... + 2032.

It is an arithmetic number, because the mean of its divisors is an integer number (61132).

2²⁴⁰⁵²³ is an apocalyptic number.

240523 is a deficient number, since it is larger than the sum of its proper divisors (4005).

240523 is an equidigital number, since it uses as much as digits as its factorization.

240523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4004.

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 240523 is about 490.4314427114. The cubic root of 240523 is about 62.1897585520.

Adding to 240523 its reverse (325042), we get a palindrome (565565).

The spelling of 240523 in words is "two hundred forty thousand, five hundred twenty-three".