23826721 has 2 divisors, whose sum is σ = 23826722. Its totient is φ = 23826720.

The previous prime is 23826713. The next prime is 23826731. The reversal of 23826721 is 12762832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23814400 + 12321 = 4880^2 + 111^2 .

It is a cyclic number.

It is not a de Polignac number, because 23826721 - 2³ = 23826713 is a prime.

It is a super-2 number, since 2×23826721² = 1135425267223682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23826731) by changing a digit.

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 as a sum of consecutive naturals, namely, 11913360 + 11913361.

It is an arithmetic number, because the mean of its divisors is an integer number (11913361).

Almost surely, 2^23826721 is an apocalyptic number.

It is an amenable number.

23826721 is a deficient number, since it is larger than the sum of its proper divisors (1).

23826721 is an equidigital number, since it uses as much as digits as its factorization.

23826721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

The square root of 23826721 is about 4881.2622342996. The cubic root of 23826721 is about 287.7540378454.

The spelling of 23826721 in words is "twenty-three million, eight hundred twenty-six thousand, seven hundred twenty-one".