126387689 has 2 divisors, whose sum is σ = 126387690. Its totient is φ = 126387688.

The previous prime is 126387683. The next prime is 126387757. The reversal of 126387689 is 986783621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105411289 + 20976400 = 10267^2 + 4580^2 .

It is an emirp because it is prime and its reverse (986783621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126387689 - 2¹⁶ = 126322153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (126387683) 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, 63193844 + 63193845.

It is an arithmetic number, because the mean of its divisors is an integer number (63193845).

Almost surely, 2^126387689 is an apocalyptic number.

It is an amenable number.

126387689 is a deficient number, since it is larger than the sum of its proper divisors (1).

126387689 is an equidigital number, since it uses as much as digits as its factorization.

126387689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 50.

The square root of 126387689 is about 11242.2279375576. The cubic root of 126387689 is about 501.8434470532.

The spelling of 126387689 in words is "one hundred twenty-six million, three hundred eighty-seven thousand, six hundred eighty-nine".