857857447 has 2 divisors, whose sum is σ = 857857448. Its totient is φ = 857857446.

The previous prime is 857857411. The next prime is 857857453. The reversal of 857857447 is 744758758.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 857857447 - 2¹¹ = 857855399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857857477) 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, 428928723 + 428928724.

It is an arithmetic number, because the mean of its divisors is an integer number (428928724).

Almost surely, 2^857857447 is an apocalyptic number.

857857447 is a deficient number, since it is larger than the sum of its proper divisors (1).

857857447 is an equidigital number, since it uses as much as digits as its factorization.

857857447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8780800, while the sum is 55.

The square root of 857857447 is about 29289.2035910845. The cubic root of 857857447 is about 950.1781556923.

The spelling of 857857447 in words is "eight hundred fifty-seven million, eight hundred fifty-seven thousand, four hundred forty-seven".