838765643 has 2 divisors, whose sum is σ = 838765644. Its totient is φ = 838765642.

The previous prime is 838765559. The next prime is 838765657. The reversal of 838765643 is 346567838.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 838765643 - 2²⁶ = 771656779 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 838765591 and 838765600.

It is not a weakly prime, because it can be changed into another prime (838765843) 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, 419382821 + 419382822.

It is an arithmetic number, because the mean of its divisors is an integer number (419382822).

Almost surely, 2^838765643 is an apocalyptic number.

838765643 is a deficient number, since it is larger than the sum of its proper divisors (1).

838765643 is an equidigital number, since it uses as much as digits as its factorization.

838765643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 50.

The square root of 838765643 is about 28961.4509822971. The cubic root of 838765643 is about 943.0764013552.

The spelling of 838765643 in words is "eight hundred thirty-eight million, seven hundred sixty-five thousand, six hundred forty-three".