853905685 has 4 divisors (see below), whose sum is σ = 1024686828. Its totient is φ = 683124544.

The previous prime is 853905677. The next prime is 853905727. The reversal of 853905685 is 586509358.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 586509358 = 2 ⋅293254679.

It can be written as a sum of positive squares in 2 ways, for example, as 344139601 + 509766084 = 18551^2 + 22578^2 .

It is a cyclic number.

It is not a de Polignac number, because 853905685 - 2³ = 853905677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85390564 + ... + 85390573.

It is an arithmetic number, because the mean of its divisors is an integer number (256171707).

Almost surely, 2^853905685 is an apocalyptic number.

It is an amenable number.

853905685 is a deficient number, since it is larger than the sum of its proper divisors (170781143).

853905685 is a wasteful number, since it uses less digits than its factorization.

853905685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170781142.

The product of its (nonzero) digits is 1296000, while the sum is 49.

The square root of 853905685 is about 29221.6646514192. The cubic root of 853905685 is about 948.7168956586.

The spelling of 853905685 in words is "eight hundred fifty-three million, nine hundred five thousand, six hundred eighty-five".