Base | Representation |
---|---|
bin | 10100111100101000001 |
3 | 1021212120021 |
4 | 2213211001 |
5 | 133431101 |
6 | 22413441 |
7 | 5556112 |
oct | 2474501 |
9 | 1255507 |
10 | 686401 |
11 | 429781 |
12 | 291281 |
13 | 1b0571 |
14 | 13c209 |
15 | d85a1 |
hex | a7941 |
686401 has 4 divisors (see below), whose sum is σ = 710100. Its totient is φ = 662704.
The previous prime is 686363. The next prime is 686417. The reversal of 686401 is 104686.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 297025 + 389376 = 545^2 + 624^2 .
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-686401 is a prime.
It is a super-2 number, since 2×6864012 = 942292665602, which contains 22 as substring.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (686201) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11806 + ... + 11863.
It is an arithmetic number, because the mean of its divisors is an integer number (177525).
2686401 is an apocalyptic number.
It is an amenable number.
686401 is a deficient number, since it is larger than the sum of its proper divisors (23699).
686401 is a wasteful number, since it uses less digits than its factorization.
686401 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 23698.
The product of its (nonzero) digits is 1152, while the sum is 25.
The square root of 686401 is about 828.4932105938. The cubic root of 686401 is about 88.2116547828.
The spelling of 686401 in words is "six hundred eighty-six thousand, four hundred one".
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