686843867 has 8 divisors (see below), whose sum is σ = 699223872. Its totient is φ = 674526600.

The previous prime is 686843851. The next prime is 686843869. The reversal of 686843867 is 768348686.

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

It is a cyclic number.

It is not a de Polignac number, because 686843867 - 2⁴ = 686843851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686843869) 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, 6692 + ... + 37662.

It is an arithmetic number, because the mean of its divisors is an integer number (87402984).

Almost surely, 2^686843867 is an apocalyptic number.

686843867 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

686843867 is a deficient number, since it is larger than the sum of its proper divisors (12380005).

686843867 is a wasteful number, since it uses less digits than its factorization.

686843867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31369.

The product of its digits is 9289728, while the sum is 56.

The square root of 686843867 is about 26207.7062521694. The cubic root of 686843867 is about 882.3062213669.

The spelling of 686843867 in words is "six hundred eighty-six million, eight hundred forty-three thousand, eight hundred sixty-seven".