23405257 has 2 divisors, whose sum is σ = 23405258. Its totient is φ = 23405256.

The previous prime is 23405203. The next prime is 23405281. The reversal of 23405257 is 75250432.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23242041 + 163216 = 4821^2 + 404^2 .

It is a cyclic number.

It is not a de Polignac number, because 23405257 - 2¹¹ = 23403209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23405357) 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, 11702628 + 11702629.

It is an arithmetic number, because the mean of its divisors is an integer number (11702629).

Almost surely, 2^23405257 is an apocalyptic number.

It is an amenable number.

23405257 is a deficient number, since it is larger than the sum of its proper divisors (1).

23405257 is an equidigital number, since it uses as much as digits as its factorization.

23405257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 28.

The square root of 23405257 is about 4837.8979939639. The cubic root of 23405257 is about 286.0472683378.

Adding to 23405257 its reverse (75250432), we get a palindrome (98655689).

The spelling of 23405257 in words is "twenty-three million, four hundred five thousand, two hundred fifty-seven".