387055217 has 2 divisors, whose sum is σ = 387055218. Its totient is φ = 387055216.

The previous prime is 387055189. The next prime is 387055219. The reversal of 387055217 is 712550783.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 288966001 + 98089216 = 16999^2 + 9904^2 .

It is a cyclic number.

It is not a de Polignac number, because 387055217 - 2⁸ = 387054961 is a prime.

Together with 387055219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (387055219) 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, 193527608 + 193527609.

It is an arithmetic number, because the mean of its divisors is an integer number (193527609).

Almost surely, 2^387055217 is an apocalyptic number.

It is an amenable number.

387055217 is a deficient number, since it is larger than the sum of its proper divisors (1).

387055217 is an equidigital number, since it uses as much as digits as its factorization.

387055217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58800, while the sum is 38.

The square root of 387055217 is about 19673.7189417761. The cubic root of 387055217 is about 728.7708200554.

The spelling of 387055217 in words is "three hundred eighty-seven million, fifty-five thousand, two hundred seventeen".