384019721 has 2 divisors, whose sum is σ = 384019722. Its totient is φ = 384019720.

The previous prime is 384019693. The next prime is 384019771. The reversal of 384019721 is 127910483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 383964025 + 55696 = 19595^2 + 236^2 .

It is an emirp because it is prime and its reverse (127910483) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 384019721 - 2¹⁰ = 384018697 is a prime.

It is a super-2 number, since 2×384019721² = 294942292233835682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (384019771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192009860 + 192009861.

It is an arithmetic number, because the mean of its divisors is an integer number (192009861).

Almost surely, 2^384019721 is an apocalyptic number.

It is an amenable number.

384019721 is a deficient number, since it is larger than the sum of its proper divisors (1).

384019721 is an equidigital number, since it uses as much as digits as its factorization.

384019721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 384019721 is about 19596.4211273385. The cubic root of 384019721 is about 726.8606797793.

The spelling of 384019721 in words is "three hundred eighty-four million, nineteen thousand, seven hundred twenty-one".