12509423 has 2 divisors, whose sum is σ = 12509424. Its totient is φ = 12509422.

The previous prime is 12509389. The next prime is 12509437. The reversal of 12509423 is 32490521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12509423 - 2¹² = 12505327 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12509392 and 12509401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12503423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6254711 + 6254712.

It is an arithmetic number, because the mean of its divisors is an integer number (6254712).

Almost surely, 2^12509423 is an apocalyptic number.

12509423 is a deficient number, since it is larger than the sum of its proper divisors (1).

12509423 is an equidigital number, since it uses as much as digits as its factorization.

12509423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 12509423 is about 3536.8662683228. The cubic root of 12509423 is about 232.1377439550.

Adding to 12509423 its reverse (32490521), we get a palindrome (44999944).

The spelling of 12509423 in words is "twelve million, five hundred nine thousand, four hundred twenty-three".