384857621 has 2 divisors, whose sum is σ = 384857622. Its totient is φ = 384857620.

The previous prime is 384857549. The next prime is 384857623. The reversal of 384857621 is 126758483.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230128900 + 154728721 = 15170^2 + 12439^2 .

It is a cyclic number.

It is not a de Polignac number, because 384857621 - 2¹⁰ = 384856597 is a prime.

Together with 384857623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (384857623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192428810 + 192428811.

It is an arithmetic number, because the mean of its divisors is an integer number (192428811).

Almost surely, 2^384857621 is an apocalyptic number.

It is an amenable number.

384857621 is a deficient number, since it is larger than the sum of its proper divisors (1).

384857621 is an equidigital number, since it uses as much as digits as its factorization.

384857621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 44.

The square root of 384857621 is about 19617.7883819762. The cubic root of 384857621 is about 727.3889461766.

The spelling of 384857621 in words is "three hundred eighty-four million, eight hundred fifty-seven thousand, six hundred twenty-one".