23406781 has 2 divisors, whose sum is σ = 23406782. Its totient is φ = 23406780.

The previous prime is 23406751. The next prime is 23406787. The reversal of 23406781 is 18760432.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22174681 + 1232100 = 4709^2 + 1110^2 .

It is a cyclic number.

It is not a de Polignac number, because 23406781 - 2⁹ = 23406269 is a prime.

It is a super-2 number, since 2×23406781² = 1095754793563922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23406787) 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, 11703390 + 11703391.

It is an arithmetic number, because the mean of its divisors is an integer number (11703391).

Almost surely, 2^23406781 is an apocalyptic number.

It is an amenable number.

23406781 is a deficient number, since it is larger than the sum of its proper divisors (1).

23406781 is an equidigital number, since it uses as much as digits as its factorization.

23406781 is an odious number, because the sum of its binary digits is odd.

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

The square root of 23406781 is about 4838.0554978214. The cubic root of 23406781 is about 286.0534767233.

The spelling of 23406781 in words is "twenty-three million, four hundred six thousand, seven hundred eighty-one".