838872557 has 2 divisors, whose sum is σ = 838872558. Its totient is φ = 838872556.

The previous prime is 838872539. The next prime is 838872607. The reversal of 838872557 is 755278838.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 793323556 + 45549001 = 28166^2 + 6749^2 .

It is a cyclic number.

It is not a de Polignac number, because 838872557 - 2⁸ = 838872301 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 838872499 and 838872508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (838872527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419436278 + 419436279.

It is an arithmetic number, because the mean of its divisors is an integer number (419436279).

Almost surely, 2^838872557 is an apocalyptic number.

It is an amenable number.

838872557 is a deficient number, since it is larger than the sum of its proper divisors (1).

838872557 is an equidigital number, since it uses as much as digits as its factorization.

838872557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3763200, while the sum is 53.

The square root of 838872557 is about 28963.2967218858. The cubic root of 838872557 is about 943.1164696737.

The spelling of 838872557 in words is "eight hundred thirty-eight million, eight hundred seventy-two thousand, five hundred fifty-seven".