686043 has 8 divisors (see below), whose sum is σ = 1016400. Its totient is φ = 457344.

The previous prime is 686041. The next prime is 686051. The reversal of 686043 is 340686.

It is not a de Polignac number, because 686043 - 2¹ = 686041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 25409 = 686043 / (6 + 8 + 6 + 0 + 4 + 3).

It is a junction number, because it is equal to n+sod(n) for n = 685998 and 686016.

It is not an unprimeable number, because it can be changed into a prime (686041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12678 + ... + 12731.

It is an arithmetic number, because the mean of its divisors is an integer number (127050).

2⁶⁸⁶⁰⁴³ is an apocalyptic number.

686043 is a deficient number, since it is larger than the sum of its proper divisors (330357).

686043 is a wasteful number, since it uses less digits than its factorization.

686043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25418 (or 25412 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 686043 is about 828.2771275364. The cubic root of 686043 is about 88.1963161958.

It can be divided in two parts, 6860 and 43, that added together give a triangular number (6903 = T₁₁₇).

The spelling of 686043 in words is "six hundred eighty-six thousand, forty-three".