384955381 has 2 divisors, whose sum is σ = 384955382. Its totient is φ = 384955380.

The previous prime is 384955379. The next prime is 384955399. The reversal of 384955381 is 183559483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 344696356 + 40259025 = 18566^2 + 6345^2 .

It is an emirp because it is prime and its reverse (183559483) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 384955381 - 2¹ = 384955379 is a prime.

It is a super-2 number, since 2×384955381² = 296381290721710322, which contains 22 as substring.

Together with 384955379, 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 (384958381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192477690 + 192477691.

It is an arithmetic number, because the mean of its divisors is an integer number (192477691).

Almost surely, 2^384955381 is an apocalyptic number.

It is an amenable number.

384955381 is a deficient number, since it is larger than the sum of its proper divisors (1).

384955381 is an equidigital number, since it uses as much as digits as its factorization.

384955381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 46.

The square root of 384955381 is about 19620.2798400023. The cubic root of 384955381 is about 727.4505304434.

The spelling of 384955381 in words is "three hundred eighty-four million, nine hundred fifty-five thousand, three hundred eighty-one".