840486617 has 2 divisors, whose sum is σ = 840486618. Its totient is φ = 840486616.

The previous prime is 840486611. The next prime is 840486653. The reversal of 840486617 is 716684048.

840486617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 640292416 + 200194201 = 25304^2 + 14149^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840486617 is a prime.

It is a super-2 number, since 2×840486617² = 1412835506712209378, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (840486611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420243308 + 420243309.

It is an arithmetic number, because the mean of its divisors is an integer number (420243309).

Almost surely, 2^840486617 is an apocalyptic number.

It is an amenable number.

840486617 is a deficient number, since it is larger than the sum of its proper divisors (1).

840486617 is an equidigital number, since it uses as much as digits as its factorization.

840486617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 258048, while the sum is 44.

The square root of 840486617 is about 28991.1472177284. The cubic root of 840486617 is about 943.7209601052.

The spelling of 840486617 in words is "eight hundred forty million, four hundred eighty-six thousand, six hundred seventeen".