23644013 has 2 divisors, whose sum is σ = 23644014. Its totient is φ = 23644012.

The previous prime is 23644009. The next prime is 23644051. The reversal of 23644013 is 31044632.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19695844 + 3948169 = 4438^2 + 1987^2 .

It is a cyclic number.

It is not a de Polignac number, because 23644013 - 2² = 23644009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23644013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23644213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11822006 + 11822007.

It is an arithmetic number, because the mean of its divisors is an integer number (11822007).

Almost surely, 2^23644013 is an apocalyptic number.

It is an amenable number.

23644013 is a deficient number, since it is larger than the sum of its proper divisors (1).

23644013 is an equidigital number, since it uses as much as digits as its factorization.

23644013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 23644013 is about 4862.5109768514. The cubic root of 23644013 is about 287.0166315071.

Adding to 23644013 its reverse (31044632), we get a palindrome (54688645).

The spelling of 23644013 in words is "twenty-three million, six hundred forty-four thousand, thirteen".