389998217 has 4 divisors (see below), whose sum is σ = 445712256. Its totient is φ = 334284180.

The previous prime is 389998211. The next prime is 389998247. The reversal of 389998217 is 712899983.

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: 712899983 = 11329 ⋅62927.

It is a cyclic number.

It is not a de Polignac number, because 389998217 - 2⁶ = 389998153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (389998211) 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, 27857009 + ... + 27857022.

It is an arithmetic number, because the mean of its divisors is an integer number (111428064).

Almost surely, 2^389998217 is an apocalyptic number.

It is an amenable number.

389998217 is a deficient number, since it is larger than the sum of its proper divisors (55714039).

389998217 is an equidigital number, since it uses as much as digits as its factorization.

389998217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55714038.

The product of its digits is 1959552, while the sum is 56.

The square root of 389998217 is about 19748.3725152226. The cubic root of 389998217 is about 730.6132439983.

The spelling of 389998217 in words is "three hundred eighty-nine million, nine hundred ninety-eight thousand, two hundred seventeen".