384643621 has 2 divisors, whose sum is σ = 384643622. Its totient is φ = 384643620.

The previous prime is 384643577. The next prime is 384643627. The reversal of 384643621 is 126346483.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 310252996 + 74390625 = 17614^2 + 8625^2 .

It is a cyclic number.

It is not a de Polignac number, because 384643621 - 2¹³ = 384635429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (384643627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192321810 + 192321811.

It is an arithmetic number, because the mean of its divisors is an integer number (192321811).

Almost surely, 2^384643621 is an apocalyptic number.

It is an amenable number.

384643621 is a deficient number, since it is larger than the sum of its proper divisors (1).

384643621 is an equidigital number, since it uses as much as digits as its factorization.

384643621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 37.

The square root of 384643621 is about 19612.3333899870. Note that the first 4 decimals coincide. The cubic root of 384643621 is about 727.2540996891.

The spelling of 384643621 in words is "three hundred eighty-four million, six hundred forty-three thousand, six hundred twenty-one".