387878828121209 has 2 divisors, whose sum is σ = 387878828121210. Its totient is φ = 387878828121208.

The previous prime is 387878828121203. The next prime is 387878828121221. The reversal of 387878828121209 is 902121828878783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 336293797039225 + 51585031081984 = 18338315^2 + 7182272^2 .

It is a cyclic number.

It is not a de Polignac number, because 387878828121209 - 2⁴⁸ = 106403851410553 is a prime.

It is not a weakly prime, because it can be changed into another prime (387878828121203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193939414060604 + 193939414060605.

It is an arithmetic number, because the mean of its divisors is an integer number (193939414060605).

Almost surely, 2^{387878828121209} is an apocalyptic number.

It is an amenable number.

387878828121209 is a deficient number, since it is larger than the sum of its proper divisors (1).

387878828121209 is an equidigital number, since it uses as much as digits as its factorization.

387878828121209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 346816512, while the sum is 74.

The spelling of 387878828121209 in words is "three hundred eighty-seven trillion, eight hundred seventy-eight billion, eight hundred twenty-eight million, one hundred twenty-one thousand, two hundred nine".