23423509 has 4 divisors (see below), whose sum is σ = 23865516. Its totient is φ = 22981504.

The previous prime is 23423489. The next prime is 23423527. The reversal of 23423509 is 90532432.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15186609 + 8236900 = 3897^2 + 2870^2 .

It is a cyclic number.

It is not a de Polignac number, because 23423509 - 2⁷ = 23423381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23423549) 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, 220924 + ... + 221029.

It is an arithmetic number, because the mean of its divisors is an integer number (5966379).

Almost surely, 2^23423509 is an apocalyptic number.

It is an amenable number.

23423509 is a deficient number, since it is larger than the sum of its proper divisors (442007).

23423509 is an equidigital number, since it uses as much as digits as its factorization.

23423509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442006.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 23423509 is about 4839.7839827827. The cubic root of 23423509 is about 286.1216046032.

It can be divided in two parts, 23423 and 509, that added together give a palindrome (23932).

The spelling of 23423509 in words is "twenty-three million, four hundred twenty-three thousand, five hundred nine".