857924929 has 2 divisors, whose sum is σ = 857924930. Its totient is φ = 857924928.

The previous prime is 857924927. The next prime is 857924933. The reversal of 857924929 is 929429758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 567154225 + 290770704 = 23815^2 + 17052^2 .

It is a cyclic number.

It is not a de Polignac number, because 857924929 - 2¹ = 857924927 is a prime.

Together with 857924927, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 857924929.

It is not a weakly prime, because it can be changed into another prime (857924927) 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, 428962464 + 428962465.

It is an arithmetic number, because the mean of its divisors is an integer number (428962465).

Almost surely, 2^857924929 is an apocalyptic number.

It is an amenable number.

857924929 is a deficient number, since it is larger than the sum of its proper divisors (1).

857924929 is an equidigital number, since it uses as much as digits as its factorization.

857924929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 55.

The square root of 857924929 is about 29290.3555628811. The cubic root of 857924929 is about 950.2030697932.

The spelling of 857924929 in words is "eight hundred fifty-seven million, nine hundred twenty-four thousand, nine hundred twenty-nine".