384072217 has 2 divisors, whose sum is σ = 384072218. Its totient is φ = 384072216.

The previous prime is 384072187. The next prime is 384072223. The reversal of 384072217 is 712270483.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 376515216 + 7557001 = 19404^2 + 2749^2 .

It is a cyclic number.

It is not a de Polignac number, because 384072217 - 2¹⁹ = 383547929 is a prime.

It is a super-2 number, since 2×384072217² = 295022935742590178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (384072917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192036108 + 192036109.

It is an arithmetic number, because the mean of its divisors is an integer number (192036109).

Almost surely, 2^384072217 is an apocalyptic number.

It is an amenable number.

384072217 is a deficient number, since it is larger than the sum of its proper divisors (1).

384072217 is an equidigital number, since it uses as much as digits as its factorization.

384072217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 384072217 is about 19597.7605098134. The cubic root of 384072217 is about 726.8937992066.

The spelling of 384072217 in words is "three hundred eighty-four million, seventy-two thousand, two hundred seventeen".