686394807 has 16 divisors (see below), whose sum is σ = 1074204672. Its totient is φ = 381624480.

The previous prime is 686394803. The next prime is 686394809. The reversal of 686394807 is 708493686.

It is not a de Polignac number, because 686394807 - 2² = 686394803 is a prime.

It is a super-2 number, since 2×686394807² = 942275662153134498, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 686394807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686394803) 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 15 ways as a sum of consecutive naturals, for example, 440919 + ... + 442472.

It is an arithmetic number, because the mean of its divisors is an integer number (67137792).

Almost surely, 2^686394807 is an apocalyptic number.

686394807 is a deficient number, since it is larger than the sum of its proper divisors (387809865).

686394807 is a wasteful number, since it uses less digits than its factorization.

686394807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883438.

The product of its (nonzero) digits is 1741824, while the sum is 51.

The square root of 686394807 is about 26199.1375239720. The cubic root of 686394807 is about 882.1138948768.

The spelling of 686394807 in words is "six hundred eighty-six million, three hundred ninety-four thousand, eight hundred seven".