686346 has 16 divisors (see below), whose sum is σ = 1392384. Its totient is φ = 225504.

The previous prime is 686339. The next prime is 686353. The reversal of 686346 is 643686.

686346 = T₉₉ + T₁₀₀ + ... + T₁₇₁.

It is an interprime number because it is at equal distance from previous prime (686339) and next prime (686353).

It is an unprimeable number.

686346 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346 + ... + 1221.

It is an arithmetic number, because the mean of its divisors is an integer number (87024).

2⁶⁸⁶³⁴⁶ is an apocalyptic number.

686346 is an abundant number, since it is smaller than the sum of its proper divisors (706038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686346 is a wasteful number, since it uses less digits than its factorization.

686346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1645.

The product of its digits is 20736, while the sum is 33.

The square root of 686346 is about 828.4600171402. The cubic root of 686346 is about 88.2092986427.

The spelling of 686346 in words is "six hundred eighty-six thousand, three hundred forty-six".