686982969 has 6 divisors (see below), whose sum is σ = 992308746. Its totient is φ = 457988640.

The previous prime is 686982953. The next prime is 686982977. The reversal of 686982969 is 969289686.

686982969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 424154025 + 262828944 = 20595^2 + 16212^2 .

It is not a de Polignac number, because 686982969 - 2⁴ = 686982953 is a prime.

It is a super-2 number, since 2×686982969² = 943891199392109922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (686981969) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38165712 + ... + 38165729.

It is an arithmetic number, because the mean of its divisors is an integer number (165384791).

Almost surely, 2^686982969 is an apocalyptic number.

It is an amenable number.

686982969 is a deficient number, since it is larger than the sum of its proper divisors (305325777).

686982969 is a wasteful number, since it uses less digits than its factorization.

686982969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76331447 (or 76331444 counting only the distinct ones).

The product of its digits is 20155392, while the sum is 63.

The square root of 686982969 is about 26210.3599555596. The cubic root of 686982969 is about 882.3657799175.

The spelling of 686982969 in words is "six hundred eighty-six million, nine hundred eighty-two thousand, nine hundred sixty-nine".