23728909 has 2 divisors, whose sum is σ = 23728910. Its totient is φ = 23728908.

The previous prime is 23728883. The next prime is 23728927. The reversal of 23728909 is 90982732.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14273284 + 9455625 = 3778^2 + 3075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23728909 is a prime.

It is a super-2 number, since 2×23728909² = 1126122244660562, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23728949) 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, 11864454 + 11864455.

It is an arithmetic number, because the mean of its divisors is an integer number (11864455).

Almost surely, 2^23728909 is an apocalyptic number.

It is an amenable number.

23728909 is a deficient number, since it is larger than the sum of its proper divisors (1).

23728909 is an equidigital number, since it uses as much as digits as its factorization.

23728909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 23728909 is about 4871.2328008421. The cubic root of 23728909 is about 287.3597410366.

The spelling of 23728909 in words is "twenty-three million, seven hundred twenty-eight thousand, nine hundred nine".