12509389 has 2 divisors, whose sum is σ = 12509390. Its totient is φ = 12509388.

The previous prime is 12509381. The next prime is 12509423. The reversal of 12509389 is 98390521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8236900 + 4272489 = 2870^2 + 2067^2 .

It is an emirp because it is prime and its reverse (98390521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12509389 - 2³ = 12509381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12509381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6254694 + 6254695.

It is an arithmetic number, because the mean of its divisors is an integer number (6254695).

Almost surely, 2^12509389 is an apocalyptic number.

It is an amenable number.

12509389 is a deficient number, since it is larger than the sum of its proper divisors (1).

12509389 is an equidigital number, since it uses as much as digits as its factorization.

12509389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 12509389 is about 3536.8614618048. The cubic root of 12509389 is about 232.1375336418.

The spelling of 12509389 in words is "twelve million, five hundred nine thousand, three hundred eighty-nine".