685599943 has 8 divisors (see below), whose sum is σ = 784284320. Its totient is φ = 587100960.

The previous prime is 685599917. The next prime is 685599983. The reversal of 685599943 is 349995586.

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 685599943 - 2²¹ = 683502791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685599983) 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, 38328 + ... + 53293.

It is an arithmetic number, because the mean of its divisors is an integer number (98035540).

Almost surely, 2^685599943 is an apocalyptic number.

685599943 is a deficient number, since it is larger than the sum of its proper divisors (98684377).

685599943 is a wasteful number, since it uses less digits than its factorization.

685599943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92697.

The product of its digits is 10497600, while the sum is 58.

The square root of 685599943 is about 26183.9634700326. The cubic root of 685599943 is about 881.7732593318.

The spelling of 685599943 in words is "six hundred eighty-five million, five hundred ninety-nine thousand, nine hundred forty-three".