389471217 has 4 divisors (see below), whose sum is σ = 519294960. Its totient is φ = 259647476.

The previous prime is 389471191. The next prime is 389471219. The reversal of 389471217 is 712174983.

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.

It is a cyclic number.

It is not a de Polignac number, because 389471217 - 2¹² = 389467121 is a prime.

It is a super-2 number, since 2×389471217² = 303375657742922178, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (389471219) 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 in 3 ways as a sum of consecutive naturals, for example, 64911867 + ... + 64911872.

It is an arithmetic number, because the mean of its divisors is an integer number (129823740).

Almost surely, 2^389471217 is an apocalyptic number.

It is an amenable number.

389471217 is a deficient number, since it is larger than the sum of its proper divisors (129823743).

389471217 is a wasteful number, since it uses less digits than its factorization.

389471217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129823742.

The product of its digits is 84672, while the sum is 42.

The square root of 389471217 is about 19735.0251329964. The cubic root of 389471217 is about 730.2840059630.

The spelling of 389471217 in words is "three hundred eighty-nine million, four hundred seventy-one thousand, two hundred seventeen".