12812389 has 2 divisors, whose sum is σ = 12812390. Its totient is φ = 12812388.

The previous prime is 12812363. The next prime is 12812411. The reversal of 12812389 is 98321821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6980164 + 5832225 = 2642^2 + 2415^2 .

It is a cyclic number.

It is not a de Polignac number, because 12812389 - 2¹⁵ = 12779621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12812329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6406194 + 6406195.

It is an arithmetic number, because the mean of its divisors is an integer number (6406195).

Almost surely, 2^12812389 is an apocalyptic number.

It is an amenable number.

12812389 is a deficient number, since it is larger than the sum of its proper divisors (1).

12812389 is an equidigital number, since it uses as much as digits as its factorization.

12812389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 34.

The square root of 12812389 is about 3579.4397606329. The cubic root of 12812389 is about 233.9968648373.

The spelling of 12812389 in words is "twelve million, eight hundred twelve thousand, three hundred eighty-nine".