23644945 has 4 divisors (see below), whose sum is σ = 28373940. Its totient is φ = 18915952.

The previous prime is 23644921. The next prime is 23644963. The reversal of 23644945 is 54944632.

It is a happy number.

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 10036224 + 13608721 = 3168^2 + 3689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23644945 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2364490 + ... + 2364499.

It is an arithmetic number, because the mean of its divisors is an integer number (7093485).

Almost surely, 2^23644945 is an apocalyptic number.

It is an amenable number.

23644945 is a deficient number, since it is larger than the sum of its proper divisors (4728995).

23644945 is an equidigital number, since it uses as much as digits as its factorization.

23644945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4728994.

The product of its digits is 103680, while the sum is 37.

The square root of 23644945 is about 4862.6068111662. The cubic root of 23644945 is about 287.0204026660.

The spelling of 23644945 in words is "twenty-three million, six hundred forty-four thousand, nine hundred forty-five".