304220217 has 8 divisors (see below), whose sum is σ = 463573696. Its totient is φ = 173840112.

The previous prime is 304220197. The next prime is 304220221. The reversal of 304220217 is 712022403.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 304220217 - 2⁷ = 304220089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 14486677 = 304220217 / (3 + 0 + 4 + 2 + 2 + 0 + 2 + 1 + 7).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 304220193 and 304220202.

It is not an unprimeable number, because it can be changed into a prime (304220297) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7243318 + ... + 7243359.

It is an arithmetic number, because the mean of its divisors is an integer number (57946712).

Almost surely, 2^304220217 is an apocalyptic number.

It is an amenable number.

304220217 is a deficient number, since it is larger than the sum of its proper divisors (159353479).

304220217 is a wasteful number, since it uses less digits than its factorization.

304220217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14486687.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 304220217 is about 17441.9097864884. The cubic root of 304220217 is about 672.5574027276.

The spelling of 304220217 in words is "three hundred four million, two hundred twenty thousand, two hundred seventeen".