23665945 has 4 divisors (see below), whose sum is σ = 28399140. Its totient is φ = 18932752.

The previous prime is 23665937. The next prime is 23665949. The reversal of 23665945 is 54956632.

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 5253264 + 18412681 = 2292^2 + 4291^2 .

It is a cyclic number.

It is not a de Polignac number, because 23665945 - 2³ = 23665937 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 23665898 and 23665907.

It is not an unprimeable number, because it can be changed into a prime (23665949) 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, 2366590 + ... + 2366599.

It is an arithmetic number, because the mean of its divisors is an integer number (7099785).

Almost surely, 2^23665945 is an apocalyptic number.

It is an amenable number.

23665945 is a deficient number, since it is larger than the sum of its proper divisors (4733195).

23665945 is an equidigital number, since it uses as much as digits as its factorization.

23665945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4733194.

The product of its digits is 194400, while the sum is 40.

The square root of 23665945 is about 4864.7656675322. The cubic root of 23665945 is about 287.1053488696.

The spelling of 23665945 in words is "twenty-three million, six hundred sixty-five thousand, nine hundred forty-five".