686841873 has 16 divisors (see below), whose sum is σ = 927902400. Its totient is φ = 451878336.

The previous prime is 686841863. The next prime is 686841907. The reversal of 686841873 is 378148686.

It is a de Polignac number, because none of the positive numbers 2^k-686841873 is a prime.

It is a super-2 number, since 2×686841873² = 943503517012296258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (686841823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65286 + ... + 75072.

It is an arithmetic number, because the mean of its divisors is an integer number (57993900).

Almost surely, 2^686841873 is an apocalyptic number.

It is an amenable number.

686841873 is a deficient number, since it is larger than the sum of its proper divisors (241060527).

686841873 is a wasteful number, since it uses less digits than its factorization.

686841873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10096.

The product of its digits is 1548288, while the sum is 51.

The square root of 686841873 is about 26207.6682098961. The cubic root of 686841873 is about 882.3053675482.

The spelling of 686841873 in words is "six hundred eighty-six million, eight hundred forty-one thousand, eight hundred seventy-three".