23418721 has 2 divisors, whose sum is σ = 23418722. Its totient is φ = 23418720.

The previous prime is 23418709. The next prime is 23418751. The reversal of 23418721 is 12781432.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15124321 + 8294400 = 3889^2 + 2880^2 .

It is a cyclic number.

It is not a de Polignac number, because 23418721 - 2¹⁵ = 23385953 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 23418721.

It is not a weakly prime, because it can be changed into another prime (23418751) by changing a digit.

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 as a sum of consecutive naturals, namely, 11709360 + 11709361.

It is an arithmetic number, because the mean of its divisors is an integer number (11709361).

Almost surely, 2^23418721 is an apocalyptic number.

It is an amenable number.

23418721 is a deficient number, since it is larger than the sum of its proper divisors (1).

23418721 is an equidigital number, since it uses as much as digits as its factorization.

23418721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 28.

The square root of 23418721 is about 4839.2893073260. The cubic root of 23418721 is about 286.1021079002.

The spelling of 23418721 in words is "twenty-three million, four hundred eighteen thousand, seven hundred twenty-one".