840760685 has 4 divisors (see below), whose sum is σ = 1008912828. Its totient is φ = 672608544.

The previous prime is 840760681. The next prime is 840760691. The reversal of 840760685 is 586067048.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 444830281 + 395930404 = 21091^2 + 19898^2 .

It is a cyclic number.

It is not a de Polignac number, because 840760685 - 2² = 840760681 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840760681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84076064 + ... + 84076073.

It is an arithmetic number, because the mean of its divisors is an integer number (252228207).

Almost surely, 2^840760685 is an apocalyptic number.

It is an amenable number.

840760685 is a deficient number, since it is larger than the sum of its proper divisors (168152143).

840760685 is a wasteful number, since it uses less digits than its factorization.

840760685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168152142.

The product of its (nonzero) digits is 322560, while the sum is 44.

The square root of 840760685 is about 28995.8735857363. The cubic root of 840760685 is about 943.8235259295.

The spelling of 840760685 in words is "eight hundred forty million, seven hundred sixty thousand, six hundred eighty-five".