23403505 has 4 divisors (see below), whose sum is σ = 28084212. Its totient is φ = 18722800.

The previous prime is 23403503. The next prime is 23403511. The reversal of 23403505 is 50530432.

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 16386304 + 7017201 = 4048^2 + 2649^2 .

It is not a de Polignac number, because 23403505 - 2¹ = 23403503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23403503) 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, 2340346 + ... + 2340355.

It is an arithmetic number, because the mean of its divisors is an integer number (7021053).

Almost surely, 2^23403505 is an apocalyptic number.

It is an amenable number.

23403505 is a deficient number, since it is larger than the sum of its proper divisors (4680707).

23403505 is an equidigital number, since it uses as much as digits as its factorization.

23403505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4680706.

The product of its (nonzero) digits is 1800, while the sum is 22.

The square root of 23403505 is about 4837.7169202011. The cubic root of 23403505 is about 286.0401308057.

Adding to 23403505 its reverse (50530432), we get a palindrome (73933937).

The spelling of 23403505 in words is "twenty-three million, four hundred three thousand, five hundred five".