12390557 has 2 divisors, whose sum is σ = 12390558. Its totient is φ = 12390556.

The previous prime is 12390541. The next prime is 12390571. The reversal of 12390557 is 75509321.

12390557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9897316 + 2493241 = 3146^2 + 1579^2 .

It is a cyclic number.

It is not a de Polignac number, because 12390557 - 2⁴ = 12390541 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12390517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6195278 + 6195279.

It is an arithmetic number, because the mean of its divisors is an integer number (6195279).

Almost surely, 2^12390557 is an apocalyptic number.

It is an amenable number.

12390557 is a deficient number, since it is larger than the sum of its proper divisors (1).

12390557 is an equidigital number, since it uses as much as digits as its factorization.

12390557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 12390557 is about 3520.0223010657. The cubic root of 12390557 is about 231.4001360575.

Adding to 12390557 its reverse (75509321), we get a palindrome (87899878).

The spelling of 12390557 in words is "twelve million, three hundred ninety thousand, five hundred fifty-seven".