838260821 has 2 divisors, whose sum is σ = 838260822. Its totient is φ = 838260820.

The previous prime is 838260811. The next prime is 838260823. The reversal of 838260821 is 128062838.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 657358321 + 180902500 = 25639^2 + 13450^2 .

It is a cyclic number.

It is not a de Polignac number, because 838260821 - 2⁶ = 838260757 is a prime.

Together with 838260823, 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 (838260823) 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, 419130410 + 419130411.

It is an arithmetic number, because the mean of its divisors is an integer number (419130411).

Almost surely, 2^838260821 is an apocalyptic number.

It is an amenable number.

838260821 is a deficient number, since it is larger than the sum of its proper divisors (1).

838260821 is an equidigital number, since it uses as much as digits as its factorization.

838260821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 838260821 is about 28952.7342577519. The cubic root of 838260821 is about 942.8871624565.

The spelling of 838260821 in words is "eight hundred thirty-eight million, two hundred sixty thousand, eight hundred twenty-one".