387390893 has 2 divisors, whose sum is σ = 387390894. Its totient is φ = 387390892.

The previous prime is 387390881. The next prime is 387390929. The reversal of 387390893 is 398093783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 317801929 + 69588964 = 17827^2 + 8342^2 .

It is an emirp because it is prime and its reverse (398093783) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 387390893 - 2¹⁰ = 387389869 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387390823) 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, 193695446 + 193695447.

It is an arithmetic number, because the mean of its divisors is an integer number (193695447).

Almost surely, 2^387390893 is an apocalyptic number.

It is an amenable number.

387390893 is a deficient number, since it is larger than the sum of its proper divisors (1).

387390893 is an equidigital number, since it uses as much as digits as its factorization.

387390893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 50.

The square root of 387390893 is about 19682.2481693530. The cubic root of 387390893 is about 728.9814361621.

The spelling of 387390893 in words is "three hundred eighty-seven million, three hundred ninety thousand, eight hundred ninety-three".