12815437 has 2 divisors, whose sum is σ = 12815438. Its totient is φ = 12815436.

The previous prime is 12815423. The next prime is 12815447. The reversal of 12815437 is 73451821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10949481 + 1865956 = 3309^2 + 1366^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12815437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12815399 and 12815408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12815417) 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, 6407718 + 6407719.

It is an arithmetic number, because the mean of its divisors is an integer number (6407719).

Almost surely, 2^12815437 is an apocalyptic number.

It is an amenable number.

12815437 is a deficient number, since it is larger than the sum of its proper divisors (1).

12815437 is an equidigital number, since it uses as much as digits as its factorization.

12815437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 31.

The square root of 12815437 is about 3579.8655002667. The cubic root of 12815437 is about 234.0154189075.

The spelling of 12815437 in words is "twelve million, eight hundred fifteen thousand, four hundred thirty-seven".