838457681 has 2 divisors, whose sum is σ = 838457682. Its totient is φ = 838457680.

The previous prime is 838457677. The next prime is 838457687. The reversal of 838457681 is 186754838.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 796142656 + 42315025 = 28216^2 + 6505^2 .

It is a cyclic number.

It is not a de Polignac number, because 838457681 - 2² = 838457677 is a prime.

It is a super-2 number, since 2×838457681² = 1406022565655795522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (838457687) 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, 419228840 + 419228841.

It is an arithmetic number, because the mean of its divisors is an integer number (419228841).

Almost surely, 2^838457681 is an apocalyptic number.

It is an amenable number.

838457681 is a deficient number, since it is larger than the sum of its proper divisors (1).

838457681 is an equidigital number, since it uses as much as digits as its factorization.

838457681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1290240, while the sum is 50.

The square root of 838457681 is about 28956.1337370858. The cubic root of 838457681 is about 942.9609669470.

The spelling of 838457681 in words is "eight hundred thirty-eight million, four hundred fifty-seven thousand, six hundred eighty-one".