686844369 has 12 divisors (see below), whose sum is σ = 993175092. Its totient is φ = 457404000.

The previous prime is 686844359. The next prime is 686844391. The reversal of 686844369 is 963448686.

It can be written as a sum of positive squares in 2 ways, for example, as 471107025 + 215737344 = 21705^2 + 14688^2 .

It is not a de Polignac number, because 686844369 - 2¹⁷ = 686713297 is a prime.

It is a super-2 number, since 2×686844369² = 943510374454016322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (686844329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32082 + ... + 49019.

It is an arithmetic number, because the mean of its divisors is an integer number (82764591).

Almost surely, 2^686844369 is an apocalyptic number.

It is an amenable number.

686844369 is a deficient number, since it is larger than the sum of its proper divisors (306330723).

686844369 is a wasteful number, since it uses less digits than its factorization.

686844369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82048 (or 82045 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 54.

The square root of 686844369 is about 26207.7158295033. The cubic root of 686844369 is about 882.3064363200.

The spelling of 686844369 in words is "six hundred eighty-six million, eight hundred forty-four thousand, three hundred sixty-nine".