785640017 has 2 divisors, whose sum is σ = 785640018. Its totient is φ = 785640016.

The previous prime is 785640001. The next prime is 785640029. The reversal of 785640017 is 710046587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 716151121 + 69488896 = 26761^2 + 8336^2 .

It is a cyclic number.

It is not a de Polignac number, because 785640017 - 2⁴ = 785640001 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (785640067) 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, 392820008 + 392820009.

It is an arithmetic number, because the mean of its divisors is an integer number (392820009).

Almost surely, 2^785640017 is an apocalyptic number.

It is an amenable number.

785640017 is a deficient number, since it is larger than the sum of its proper divisors (1).

785640017 is an equidigital number, since it uses as much as digits as its factorization.

785640017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 785640017 is about 28029.2707183045. The cubic root of 785640017 is about 922.7297692705.

The spelling of 785640017 in words is "seven hundred eighty-five million, six hundred forty thousand, seventeen".