386978091817 has 2 divisors, whose sum is σ = 386978091818. Its totient is φ = 386978091816.

The previous prime is 386978091751. The next prime is 386978091833. The reversal of 386978091817 is 718190879683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 350459264016 + 36518827801 = 591996^2 + 191099^2 .

It is a cyclic number.

It is not a de Polignac number, because 386978091817 - 2¹⁵ = 386978059049 is a prime.

It is a super-2 number, since 2×386978091817² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (386978097817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193489045908 + 193489045909.

It is an arithmetic number, because the mean of its divisors is an integer number (193489045909).

Almost surely, 2^386978091817 is an apocalyptic number.

It is an amenable number.

386978091817 is a deficient number, since it is larger than the sum of its proper divisors (1).

386978091817 is an equidigital number, since it uses as much as digits as its factorization.

386978091817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36578304, while the sum is 67.

The spelling of 386978091817 in words is "three hundred eighty-six billion, nine hundred seventy-eight million, ninety-one thousand, eight hundred seventeen".