23926781 has 2 divisors, whose sum is σ = 23926782. Its totient is φ = 23926780.

The previous prime is 23926729. The next prime is 23926813. The reversal of 23926781 is 18762932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23921881 + 4900 = 4891^2 + 70^2 .

It is a cyclic number.

It is not a de Polignac number, because 23926781 - 2⁶ = 23926717 is a prime.

It is a super-2 number, since 2×23926781² = 1144981698043922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23926181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11963390 + 11963391.

It is an arithmetic number, because the mean of its divisors is an integer number (11963391).

Almost surely, 2^23926781 is an apocalyptic number.

It is an amenable number.

23926781 is a deficient number, since it is larger than the sum of its proper divisors (1).

23926781 is an equidigital number, since it uses as much as digits as its factorization.

23926781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 23926781 is about 4891.5008944086. The cubic root of 23926781 is about 288.1562817237.

The spelling of 23926781 in words is "twenty-three million, nine hundred twenty-six thousand, seven hundred eighty-one".