42523 has 4 divisors (see below), whose sum is σ = 45808. Its totient is φ = 39240.

The previous prime is 42509. The next prime is 42533. The reversal of 42523 is 32524.

42523 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.

It is a cyclic number.

It is not a de Polignac number, because 42523 - 2⁵ = 42491 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42497 and 42506.

It is not an unprimeable number, because it can be changed into a prime (42533) 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, 1623 + ... + 1648.

It is an arithmetic number, because the mean of its divisors is an integer number (11452).

2⁴²⁵²³ is an apocalyptic number.

42523 is a deficient number, since it is larger than the sum of its proper divisors (3285).

42523 is a wasteful number, since it uses less digits than its factorization.

42523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3284.

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

The square root of 42523 is about 206.2110569295. The cubic root of 42523 is about 34.9039543635.

Subtracting from 42523 its reverse (32524), we obtain a palindrome (9999).

It can be divided in two parts, 42 and 523, that added together give a palindrome (565).

The spelling of 42523 in words is "forty-two thousand, five hundred twenty-three".