23406505 has 4 divisors (see below), whose sum is σ = 28087812. Its totient is φ = 18725200.

The previous prime is 23406473. The next prime is 23406511. The reversal of 23406505 is 50560432.

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 4116841 + 19289664 = 2029^2 + 4392^2 .

It is not a de Polignac number, because 23406505 - 2⁵ = 23406473 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23406505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2340646 + ... + 2340655.

It is an arithmetic number, because the mean of its divisors is an integer number (7021953).

Almost surely, 2^23406505 is an apocalyptic number.

It is an amenable number.

23406505 is a deficient number, since it is larger than the sum of its proper divisors (4681307).

23406505 is an equidigital number, since it uses as much as digits as its factorization.

23406505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4681306.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 23406505 is about 4838.0269738810. The cubic root of 23406505 is about 286.0523523900.

Adding to 23406505 its reverse (50560432), we get a palindrome (73966937).

The spelling of 23406505 in words is "twenty-three million, four hundred six thousand, five hundred five".