387856813 has 2 divisors, whose sum is σ = 387856814. Its totient is φ = 387856812.

The previous prime is 387856801. The next prime is 387856837. The reversal of 387856813 is 318658783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 352012644 + 35844169 = 18762^2 + 5987^2 .

It is an emirp because it is prime and its reverse (318658783) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 387856813 - 2¹³ = 387848621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387856213) 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, 193928406 + 193928407.

It is an arithmetic number, because the mean of its divisors is an integer number (193928407).

Almost surely, 2^387856813 is an apocalyptic number.

It is an amenable number.

387856813 is a deficient number, since it is larger than the sum of its proper divisors (1).

387856813 is an equidigital number, since it uses as much as digits as its factorization.

387856813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 49.

The square root of 387856813 is about 19694.0806589188. The cubic root of 387856813 is about 729.2735708525.

The spelling of 387856813 in words is "three hundred eighty-seven million, eight hundred fifty-six thousand, eight hundred thirteen".