387665647 has 2 divisors, whose sum is σ = 387665648. Its totient is φ = 387665646.

The previous prime is 387665623. The next prime is 387665689. The reversal of 387665647 is 746566783.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (746566783) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 387665647 - 2¹¹ = 387663599 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 387665594 and 387665603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387662647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193832823 + 193832824.

It is an arithmetic number, because the mean of its divisors is an integer number (193832824).

Almost surely, 2^387665647 is an apocalyptic number.

387665647 is a deficient number, since it is larger than the sum of its proper divisors (1).

387665647 is an equidigital number, since it uses as much as digits as its factorization.

387665647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 52.

The square root of 387665647 is about 19689.2266734882. The cubic root of 387665647 is about 729.1537369194.

The spelling of 387665647 in words is "three hundred eighty-seven million, six hundred sixty-five thousand, six hundred forty-seven".