345666 has 16 divisors (see below), whose sum is σ = 705024. Its totient is φ = 112944.

The previous prime is 345659. The next prime is 345673. The reversal of 345666 is 666543.

It is an interprime number because it is at equal distance from previous prime (345659) and next prime (345673).

It is a d-powerful number, because it can be written as 3³ + 4⁸ + 6 + 5³ + 6² + 6⁷ .

It is a Curzon number.

It is a plaindrome in base 10.

It is an unprimeable number.

345666 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226 + ... + 861.

It is an arithmetic number, because the mean of its divisors is an integer number (44064).

2³⁴⁵⁶⁶⁶ is an apocalyptic number.

345666 is an abundant number, since it is smaller than the sum of its proper divisors (359358).

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

345666 is a wasteful number, since it uses less digits than its factorization.

345666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145.

The product of its digits is 12960, while the sum is 30.

The square root of 345666 is about 587.9336697281. The cubic root of 345666 is about 70.1808926821.

Adding to 345666 its sum of digits (30), we get a triangular number (345696 = T₈₃₁).

The spelling of 345666 in words is "three hundred forty-five thousand, six hundred sixty-six".