838678381 has 2 divisors, whose sum is σ = 838678382. Its totient is φ = 838678380.

The previous prime is 838678367. The next prime is 838678439. The reversal of 838678381 is 183876838.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 677769156 + 160909225 = 26034^2 + 12685^2 .

It is a cyclic number.

It is not a de Polignac number, because 838678381 - 2²³ = 830289773 is a prime.

It is a super-2 number, since 2×838678381² = 1406762853513562322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (838672381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419339190 + 419339191.

It is an arithmetic number, because the mean of its divisors is an integer number (419339191).

Almost surely, 2^838678381 is an apocalyptic number.

It is an amenable number.

838678381 is a deficient number, since it is larger than the sum of its proper divisors (1).

838678381 is an equidigital number, since it uses as much as digits as its factorization.

838678381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1548288, while the sum is 52.

The square root of 838678381 is about 28959.9444232892. The cubic root of 838678381 is about 943.0436955223.

The spelling of 838678381 in words is "eight hundred thirty-eight million, six hundred seventy-eight thousand, three hundred eighty-one".