838740689 has 2 divisors, whose sum is σ = 838740690. Its totient is φ = 838740688.

The previous prime is 838740677. The next prime is 838740703. The reversal of 838740689 is 986047838.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 828288400 + 10452289 = 28780^2 + 3233^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-838740689 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 838740689.

It is not a weakly prime, because it can be changed into another prime (838745689) 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, 419370344 + 419370345.

It is an arithmetic number, because the mean of its divisors is an integer number (419370345).

Almost surely, 2^838740689 is an apocalyptic number.

It is an amenable number.

838740689 is a deficient number, since it is larger than the sum of its proper divisors (1).

838740689 is an equidigital number, since it uses as much as digits as its factorization.

838740689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2322432, while the sum is 53.

The square root of 838740689 is about 28961.0201650425. The cubic root of 838740689 is about 943.0670488175.

The spelling of 838740689 in words is "eight hundred thirty-eight million, seven hundred forty thousand, six hundred eighty-nine".