838194421 has 2 divisors, whose sum is σ = 838194422. Its totient is φ = 838194420.

The previous prime is 838194407. The next prime is 838194491. The reversal of 838194421 is 124491838.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 715295025 + 122899396 = 26745^2 + 11086^2 .

It is a cyclic number.

It is not a de Polignac number, because 838194421 - 2⁵ = 838194389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (838194491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419097210 + 419097211.

It is an arithmetic number, because the mean of its divisors is an integer number (419097211).

Almost surely, 2^838194421 is an apocalyptic number.

It is an amenable number.

838194421 is a deficient number, since it is larger than the sum of its proper divisors (1).

838194421 is an equidigital number, since it uses as much as digits as its factorization.

838194421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 40.

The square root of 838194421 is about 28951.5875385099. The cubic root of 838194421 is about 942.8622659250.

The spelling of 838194421 in words is "eight hundred thirty-eight million, one hundred ninety-four thousand, four hundred twenty-one".