686944493 has 8 divisors (see below), whose sum is σ = 701200800. Its totient is φ = 672775408.

The previous prime is 686944477. The next prime is 686944499. The reversal of 686944493 is 394449686.

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 686944493 - 2⁴ = 686944477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686944499) 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, 5771 + ... + 37512.

It is an arithmetic number, because the mean of its divisors is an integer number (87650100).

Almost surely, 2^686944493 is an apocalyptic number.

It is an amenable number.

686944493 is a deficient number, since it is larger than the sum of its proper divisors (14256307).

686944493 is a wasteful number, since it uses less digits than its factorization.

686944493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43611.

The product of its digits is 4478976, while the sum is 53.

The square root of 686944493 is about 26209.6259607038. The cubic root of 686944493 is about 882.3493066612.

The spelling of 686944493 in words is "six hundred eighty-six million, nine hundred forty-four thousand, four hundred ninety-three".