857303989 has 2 divisors, whose sum is σ = 857303990. Its totient is φ = 857303988.

The previous prime is 857303983. The next prime is 857304011. The reversal of 857303989 is 989303758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 774675889 + 82628100 = 27833^2 + 9090^2 .

It is a cyclic number.

It is not a de Polignac number, because 857303989 - 2⁹ = 857303477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857303983) 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, 428651994 + 428651995.

It is an arithmetic number, because the mean of its divisors is an integer number (428651995).

Almost surely, 2^857303989 is an apocalyptic number.

It is an amenable number.

857303989 is a deficient number, since it is larger than the sum of its proper divisors (1).

857303989 is an equidigital number, since it uses as much as digits as its factorization.

857303989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The square root of 857303989 is about 29279.7539094850. The cubic root of 857303989 is about 949.9737717597.

The spelling of 857303989 in words is "eight hundred fifty-seven million, three hundred three thousand, nine hundred eighty-nine".