686843855 has 8 divisors (see below), whose sum is σ = 824451264. Its totient is φ = 549316000.

The previous prime is 686843851. The next prime is 686843869. The reversal of 686843855 is 558348686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 686843855 - 2² = 686843851 is a prime.

It is a super-2 number, since 2×686843855² = 943508962302522050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 686843797 and 686843806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686843851) 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 in 7 ways as a sum of consecutive naturals, for example, 1130 + ... + 37080.

It is an arithmetic number, because the mean of its divisors is an integer number (103056408).

Almost surely, 2^686843855 is an apocalyptic number.

686843855 is a deficient number, since it is larger than the sum of its proper divisors (137607409).

686843855 is a wasteful number, since it uses less digits than its factorization.

686843855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39777.

The product of its digits is 5529600, while the sum is 53.

The square root of 686843855 is about 26207.7060232291. The cubic root of 686843855 is about 882.3062162286.

The spelling of 686843855 in words is "six hundred eighty-six million, eight hundred forty-three thousand, eight hundred fifty-five".