858257993 has 2 divisors, whose sum is σ = 858257994. Its totient is φ = 858257992.

The previous prime is 858257989. The next prime is 858258047. The reversal of 858257993 is 399752858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 736199689 + 122058304 = 27133^2 + 11048^2 .

It is a cyclic number.

It is not a de Polignac number, because 858257993 - 2² = 858257989 is a prime.

It is not a weakly prime, because it can be changed into another prime (858257963) 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, 429128996 + 429128997.

It is an arithmetic number, because the mean of its divisors is an integer number (429128997).

Almost surely, 2^858257993 is an apocalyptic number.

It is an amenable number.

858257993 is a deficient number, since it is larger than the sum of its proper divisors (1).

858257993 is an equidigital number, since it uses as much as digits as its factorization.

858257993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5443200, while the sum is 56.

The square root of 858257993 is about 29296.0405686502. The cubic root of 858257993 is about 950.3260166382.

The spelling of 858257993 in words is "eight hundred fifty-eight million, two hundred fifty-seven thousand, nine hundred ninety-three".