340686 has 24 divisors (see below), whose sum is σ = 766584. Its totient is φ = 113400.

The previous prime is 340661. The next prime is 340687. The reversal of 340686 is 686043.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340687) 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, 136 + ... + 836.

It is an arithmetic number, because the mean of its divisors is an integer number (31941).

2³⁴⁰⁶⁸⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 340686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (383292).

340686 is an abundant number, since it is smaller than the sum of its proper divisors (425898).

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

340686 is an equidigital number, since it uses as much as digits as its factorization.

340686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718 (or 706 counting only the distinct ones).

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

The square root of 340686 is about 583.6831332153. The cubic root of 340686 is about 69.8422297088.

The spelling of 340686 in words is "three hundred forty thousand, six hundred eighty-six".