12487889 has 2 divisors, whose sum is σ = 12487890. Its totient is φ = 12487888.

The previous prime is 12487861. The next prime is 12487901. The reversal of 12487889 is 98878421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9102289 + 3385600 = 3017^2 + 1840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12487889 is a prime.

It is not a weakly prime, because it can be changed into another prime (12487819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6243944 + 6243945.

It is an arithmetic number, because the mean of its divisors is an integer number (6243945).

Almost surely, 2^12487889 is an apocalyptic number.

It is an amenable number.

12487889 is a deficient number, since it is larger than the sum of its proper divisors (1).

12487889 is an equidigital number, since it uses as much as digits as its factorization.

12487889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 47.

The square root of 12487889 is about 3533.8207368230. The cubic root of 12487889 is about 232.0044650845.

The spelling of 12487889 in words is "twelve million, four hundred eighty-seven thousand, eight hundred eighty-nine".