685791843 has 16 divisors (see below), whose sum is σ = 1007803776. Its totient is φ = 411344640.

The previous prime is 685791839. The next prime is 685791853. The reversal of 685791843 is 348197586.

It is not a de Polignac number, because 685791843 - 2² = 685791839 is a prime.

It is not an unprimeable number, because it can be changed into a prime (685791823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103921 + ... + 110322.

It is an arithmetic number, because the mean of its divisors is an integer number (62987736).

Almost surely, 2^685791843 is an apocalyptic number.

685791843 is a deficient number, since it is larger than the sum of its proper divisors (322011933).

685791843 is a wasteful number, since it uses less digits than its factorization.

685791843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214354.

The product of its digits is 1451520, while the sum is 51.

The square root of 685791843 is about 26187.6276703332. The cubic root of 685791843 is about 881.8555213492.

The spelling of 685791843 in words is "six hundred eighty-five million, seven hundred ninety-one thousand, eight hundred forty-three".