838578649 has 2 divisors, whose sum is σ = 838578650. Its totient is φ = 838578648.

The previous prime is 838578593. The next prime is 838578679. The reversal of 838578649 is 946875838.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 838392025 + 186624 = 28955^2 + 432^2 .

It is a cyclic number.

It is not a de Polignac number, because 838578649 - 2¹⁹ = 838054361 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 838578593 and 838578602.

It is not a weakly prime, because it can be changed into another prime (838578679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419289324 + 419289325.

It is an arithmetic number, because the mean of its divisors is an integer number (419289325).

Almost surely, 2^838578649 is an apocalyptic number.

It is an amenable number.

838578649 is a deficient number, since it is larger than the sum of its proper divisors (1).

838578649 is an equidigital number, since it uses as much as digits as its factorization.

838578649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11612160, while the sum is 58.

The square root of 838578649 is about 28958.2224765264. Note that the first 3 decimals coincide. The cubic root of 838578649 is about 943.0063131501.

The spelling of 838578649 in words is "eight hundred thirty-eight million, five hundred seventy-eight thousand, six hundred forty-nine".