387430217 has 4 divisors (see below), whose sum is σ = 388200960. Its totient is φ = 386659476.

The previous prime is 387430177. The next prime is 387430223. The reversal of 387430217 is 712034783.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 712034783 = 17 ⋅41884399.

It is a cyclic number.

It is not a de Polignac number, because 387430217 - 2⁸ = 387429961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387400217) 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 in 3 ways as a sum of consecutive naturals, for example, 384617 + ... + 385622.

It is an arithmetic number, because the mean of its divisors is an integer number (97050240).

Almost surely, 2^387430217 is an apocalyptic number.

It is an amenable number.

387430217 is a deficient number, since it is larger than the sum of its proper divisors (770743).

387430217 is an equidigital number, since it uses as much as digits as its factorization.

387430217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770742.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 387430217 is about 19683.2471152501. The cubic root of 387430217 is about 729.0061015983.

The spelling of 387430217 in words is "three hundred eighty-seven million, four hundred thirty thousand, two hundred seventeen".