844622381 has 2 divisors, whose sum is σ = 844622382. Its totient is φ = 844622380.

The previous prime is 844622377. The next prime is 844622411. The reversal of 844622381 is 183226448.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 839029156 + 5593225 = 28966^2 + 2365^2 .

It is a cyclic number.

It is not a de Polignac number, because 844622381 - 2² = 844622377 is a prime.

It is a super-2 number, since 2×844622381² = 1426773932972218322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (844622881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422311190 + 422311191.

It is an arithmetic number, because the mean of its divisors is an integer number (422311191).

Almost surely, 2^844622381 is an apocalyptic number.

It is an amenable number.

844622381 is a deficient number, since it is larger than the sum of its proper divisors (1).

844622381 is an equidigital number, since it uses as much as digits as its factorization.

844622381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73728, while the sum is 38.

The square root of 844622381 is about 29062.3877374176. The cubic root of 844622381 is about 945.2663437452.

The spelling of 844622381 in words is "eight hundred forty-four million, six hundred twenty-two thousand, three hundred eighty-one".