838420643 has 2 divisors, whose sum is σ = 838420644. Its totient is φ = 838420642.

The previous prime is 838420591. The next prime is 838420669. The reversal of 838420643 is 346024838.

838420643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 838420643 - 2¹² = 838416547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 838420597 and 838420606.

It is not a weakly prime, because it can be changed into another prime (838470643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419210321 + 419210322.

It is an arithmetic number, because the mean of its divisors is an integer number (419210322).

Almost surely, 2^838420643 is an apocalyptic number.

838420643 is a deficient number, since it is larger than the sum of its proper divisors (1).

838420643 is an equidigital number, since it uses as much as digits as its factorization.

838420643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 38.

The square root of 838420643 is about 28955.4941764080. The cubic root of 838420643 is about 942.9470819677.

The spelling of 838420643 in words is "eight hundred thirty-eight million, four hundred twenty thousand, six hundred forty-three".