387866138393 has 2 divisors, whose sum is σ = 387866138394. Its totient is φ = 387866138392.

The previous prime is 387866138389. The next prime is 387866138399. The reversal of 387866138393 is 393831668783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 250483233289 + 137382905104 = 500483^2 + 370652^2 .

It is a cyclic number.

It is not a de Polignac number, because 387866138393 - 2² = 387866138389 is a prime.

It is not a weakly prime, because it can be changed into another prime (387866138399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193933069196 + 193933069197.

It is an arithmetic number, because the mean of its divisors is an integer number (193933069197).

Almost surely, 2^387866138393 is an apocalyptic number.

It is an amenable number.

387866138393 is a deficient number, since it is larger than the sum of its proper divisors (1).

387866138393 is an equidigital number, since it uses as much as digits as its factorization.

387866138393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94058496, while the sum is 65.

The spelling of 387866138393 in words is "three hundred eighty-seven billion, eight hundred sixty-six million, one hundred thirty-eight thousand, three hundred ninety-three".