840486689 has 4 divisors (see below), whose sum is σ = 960556224. Its totient is φ = 720417156.

The previous prime is 840486653. The next prime is 840486707. The reversal of 840486689 is 986684048.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 840486689 - 2⁸ = 840486433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 840486689.

It is not an unprimeable number, because it can be changed into a prime (840486089) 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 in 3 ways as a sum of consecutive naturals, for example, 60034757 + ... + 60034770.

It is an arithmetic number, because the mean of its divisors is an integer number (240139056).

Almost surely, 2^840486689 is an apocalyptic number.

It is an amenable number.

840486689 is a deficient number, since it is larger than the sum of its proper divisors (120069535).

840486689 is a wasteful number, since it uses less digits than its factorization.

840486689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120069534.

The product of its (nonzero) digits is 2654208, while the sum is 53.

The square root of 840486689 is about 28991.1484594867. The cubic root of 840486689 is about 943.7209870531.

The spelling of 840486689 in words is "eight hundred forty million, four hundred eighty-six thousand, six hundred eighty-nine".