23340781 has 2 divisors, whose sum is σ = 23340782. Its totient is φ = 23340780.

The previous prime is 23340769. The next prime is 23340803. The reversal of 23340781 is 18704332.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23328900 + 11881 = 4830^2 + 109^2 .

It is a cyclic number.

It is not a de Polignac number, because 23340781 - 2¹⁵ = 23308013 is a prime.

It is a super-2 number, since 2×23340781² = 1089584115379922, which contains 22 as substring.

It is a Chen prime.

It is equal to p_1468342 and since 23340781 and 1468342 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23340481) 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, 11670390 + 11670391.

It is an arithmetic number, because the mean of its divisors is an integer number (11670391).

Almost surely, 2^23340781 is an apocalyptic number.

It is an amenable number.

23340781 is a deficient number, since it is larger than the sum of its proper divisors (1).

23340781 is an equidigital number, since it uses as much as digits as its factorization.

23340781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 23340781 is about 4831.2297606303. The cubic root of 23340781 is about 285.7843623705.

It can be divided in two parts, 233 and 40781, that added together give a palindrome (41014).

The spelling of 23340781 in words is "twenty-three million, three hundred forty thousand, seven hundred eighty-one".